Thibaut Courtois is proof that the system can work, but beyond Chelsea's No 1 there have been few examples where a player has made the leap to first-team football at Stamford Bridge via a successful loan move.

Roma have already triggered their option to sign Mohamed Salah while former loanees Romelu Lukaku and Kevin de Bruyne were sold for healthy profits but have since gone to prove their worth.

From first-team cast-offs via the club's own academy produce to those merely used as financial enterprises, Sportsmail runs the rule over all 34 of Chelsea's loanees this term and assesses their chances of breaking into the first-team squad in the next couple of seasons.

Striker Patrick Bamford was one of 34 players Chelsea loaned out across Europe during the 2015-16 season

Nathan Ake enjoyed a fine season for Watford as the marauding left-back was named Young Player of the Year

NATHAN AKE

Dutchman Ake signed a new five-year deal with Chelsea in August last year, before being sent on loan to Premier League new-boys Watford for the season.

The 21-year-old left back made 28 appearances for the Hornets in all competitions, helping to cement their place in English football's top tier.

He showed himself to be a capable defender at the highest level, albeit with room for improvement.

Chances of breaking into first-team squad in next couple of seasons - 7/10

Bekanty Victorien Angban has been plying his trade in the Belgian Pro League this season with Sint-Truidense

BEKANTY VICTORIEN ANGBAN

Angban is an attacking midfielder who has represented Ivory Coast at Under 20 level.

The 19-year-old spent this campaign on loan at Sint-Truidense in the Belgian Pro League, who came first in the second tier the previous season.

Angban played 23 times, mostly as a starter, as his team finished 13th from 16 teams but his discipline is a concern as he was sent off twice and booked eight times. He also failed to find the back of the net.

Chances of breaking into first-team squad in next couple of seasons - 1/10

Christian Atsu was a disappointment at Bournemouth before his loan move to the south coast was cut short

CHRISTIAN ATSU

Atsu signed for the Blues from Porto in September 2013 with much expected of him, yet ever since the move his club career has failed to kick on.

After spells at Vitesse Arnhem and Everton, the 42-capped Ghana international joined Premier League newcomers Bournemouth on loan at the start of the season, with Cherries chief executive Neill Blake calling the deal 'a huge coup.'

But after making just two League Cup appearances on the south coast, he was recalled by Chelsea on January 1, before moving to Malaga on loan where he scored twice in 11 La Liga appearances.

Chances of breaking into first-team squad in next couple of seasons - 3/10

Lewis Baker took his development abroad this season at Vitesse having previously been loaned out in England

LEWIS BAKER

Following his time on loan at Sheffield Wednesday and Milton Keynes Dons, Luton-born Baker was given a chance to impress in Holland with Vitesse this season.

The 21-year-old, a two-footed creative midfielder, was an ever-present and scored five times in 31 Eredivisie games, while his team finished ninth from 18 teams.

Chances of breaking into first-team squad in next couple of seasons - 7/10

Patrick Bamford spent the first half of the season on loan at Crystal Palace before joining Norwich in January

PATRICK BAMFORD

Bamford has enjoyed fruitful loan spells at MK Dons, Derby County, and Middlesbrough - where he scored 17 goals in 38 Championship games as they narrowly missed out on promotion last season.

However, this term Bamford found the step up to the Premier League far more difficult, failing to score at all.

He made just six top-tier appearances under Alan Pardew before terminating his loan spell with Crystal Palace on December 28; he then joined Norwich City, who were relegated with Bamford appearing a mere seven times.

Chances of breaking into first-team squad in next couple of seasons - 4/10

22-year-old goalkeeper Jamal Blackman will remain on loan at Swedish side Ostersunds until the end of May

JAMAL BLACKMAN

With Chelsea since U13 level, Blackman joined Swedish side Ostersunds on loan on March 18 to gain first-team experience in the Allsvenskan.

The 22-year-old has played in all nine of his team's games so far this season as they sit seventh in a league of 16 teams. His loan lasts until May 31.

Chances of breaking into first-team squad in next couple of seasons - 5/10

Jeremie Boga impressed during a loan spell with Ligue 1 side Rennes this season, making 27 appearances

JEREMIE BOGA

In 2008, Boga joined Chelsea from ASPTT Marseille as a youngster and the Frenchman was sent back to his homeland on August 31, 2015, joining Rennes on loan.

The 19-year-old midfielder made an impression across the English Channel, playing 27 Ligue 1 games, scoring twice, and helping his team to eighth in the division of 20.

Chances of breaking into first-team squad in next couple of seasons - 6/10

Isaiah Brown (left) joined several Chelsea players to have made the well-trodden path to Dutch side Vitesse

ISAIAH BROWN

Like Baker, versatile attacker Brown spent the season on loan at Vitesse.

The 19-year-old former West Bromwich Albion prospect, two years younger than team-mate Baker, made 22 appearances in the Eredivisie, scoring once, as he continues his development.

Chances of breaking into first-team squad in next couple of seasons - 5/10

Nathaniel Chalobah found his chances of first team chances at Napoli few and far between during his loan spell

NATHANIEL CHALOBAH

In 2014-2015, Chalobah briefly featured in the Premier League with Burnley before moving to his fourth Championship team, where he played more often for Reading.

The midfielder joined Serie A outfit Napoli on September 1 last year to spend a season in Italy with his sixth loan team since 2012.

The 24-time England U21 international made just nine appearances in all competitions for Maurizio Sarri's side, scoring once in Europe.

Chances of breaking into first-team squad in next couple of seasons - 3/10

Andreas Christensen has been one of the few major success stories to emerge from this season's cohort

ANDREAS CHRISTENSEN

Denmark international defender Christensen spent the 2015-2016 campaign on loan at Bundesliga club Borussia Monchengladbach - on July 10 last year, he joined Andre Schubert's men on a two-year loan deal.

The 20-year-old took to Germany extremely well, playing 39 times in all competitions for Gladbach - who came fourth in their league - scoring three times and picking up just one booking.

Chances of breaking into first-team squad in next couple of seasons - 8/10

Colombia winger Juan Cuadrado spent the 2015-16 season on loan at Antonio Conte's former club Juventus

JUAN CUADRADO

Colombian winger Cuadrado was one player who was singled out for criticism during Chelsea's title-winning season in 2014-2015.

Jose Mourinho signed him for an initial fee of £23.3 million from Fiorentina but after he failed to settle in England he was sent back to Italy for a season, with Juventus in August last year.

Despite not possessing the impact he had in Florence, scoring just four Serie A goals he did still help the Old Lady to the title, with the 27-year-old playing in 28 league games.

Chances of breaking into first-team squad in next couple of seasons - 7/10

Cristian Cuevas was one of three players to be sent on loan to Belgian side Sint-Truiden, featuring 28 times

CRISTIAN CUEVAS

Cuevas joined Chelsea from O'Higgins in July 2013 and is a Chile U20 international.

On August 10, 2015, Cuevas was sent on a season-long loan to Sint-Truiden along with Angban, and the left-sided player featured 28 times for the club in both the Belgian Pro-League and Belgian Division 1.

However, the Blues will not be happy with his conduct as the 21-year-old collected a whopping 13 bookings.

Chances of breaking into first-team squad in next couple of seasons - 1/10

ALEX DAVEY

On August 8, 2015, defender Davey joined League One's Peterborough United on a one-month loan deal, which was extended until January 3, 2016, after impressing then-manager Dave Robertson.

Robertson was sacked shortly after Davey's extension and the 21-year-old did not play past September 29, after making just 10 appearances for Posh, which included seven defeats.

On March 15, Davey joined Norwegian side Stabaek to play for the Tippeligaen division team on loan until July 22.

Chances of breaking into first-team squad in next couple of seasons - 1/10

Matej Delac has just completed his eighth loan move since joining Chelsea and he is no closer to the first team

MATEJ DELAC

Former Croatia U21 international goalkeeper Delac was sent to Sarajevo for a season last August - his eighth loan spell since joining the Blues in 2010.

Having finished the previous campaign with the Bosnians, he once again plied his trade at the Asim Ferhatovic Hase Stadium but kept goal just 12 times as his team came fourth in the 16-team Premier Liga.

Chances of breaking into first-team squad in next couple of seasons - 1/10

Defender Papy Djilobodji played just one minute for Chelsea before joining Werder Bremen on loan in January

PAPY DJILOBODJI

Djilobodji joined from Nantes on transfer deadline day last summer but the defensive-minded Senegal international played just once for the Blues in the League Cup before signing for Bundesliga team Werder Bremen for the rest of the season, on January 21.

A virtual ever-present, the 27-year-old played 16 times in all competitions, as Viktor Skrypnyk's Werder came 13th out of 18 teams in the Bundesliga.

Chances of breaking into first-team squad in next couple of seasons - 5/10

Michael Hector played 30 games and scored once for Reading in a disappointing season for the Royals

MICHAEL HECTOR

Defender Hector signed for the Blues in September 2015 and the Jamaica international was immediately loaned back to former club Reading.

The Royals endured a largely disappointing campaign as they came 17th out of 24 Championship teams, with 23-year-old Hector playing on 30 occasions in the second tier this season, scoring once.

Chances of breaking into first-team squad in next couple of seasons - 6/10

Jordan Houghton was at Gillingham for the first half of the season before joining Plymouth Argyle in January

JORDAN HOUGHTON

Houghton is a 20-year-old midfielder who spent the first half of the season on loan at League One club Gillingham.

He played 11 matches (starting 10) and scored once for the Kent-based side, before they opted against extending his loan in January.

On March 10, Houghton signed for League Two side Plymouth Argyle on loan and helped them to the play-offs with 11 games and one goal.

Chances of breaking into first-team squad in next couple of seasons - 2/10

Tomas Kalas stayed at Middlesbrough after spending the second half of the 2014-15 season at the Riverside

TOMAS KALAS

Czech Republic international Kalas once again spent the season on loan at Middlesbrough, after he headed to the Riverside to play during the second half of the previous campaign.

The defender, who recently turned 23, played 30 times in all competitions as part of Aitor Karanka's squad, as Boro were promoted to the Premier League.

Chances of breaking into first-team squad in next couple of seasons - 3/10

Todd Kane gained first team experience with Dutch side NEC Nijmegen but his chances at Chelsea look slim

TODD KANE

On August 6, 2015, Kane joined NEC Nijmegen on a season-long loan to gain first team experience abroad. The 22-year-old right back played 31 games in the Eredivisie, 29 times getting a starting berth, as his adopted side took 10th place, one behind Vitesse.

Chances of breaking into first-team squad in next couple of seasons - 4/10

Marko Marin was expected to be a success at Chelsea but he has been the subject of several loan moves

MARKO MARIN

Marin's transfer to Chelsea from Werder Bremen was agreed in April 2012 but the German failed to make an impression at Stamford Bridge, performing just six times in the Premier League during his debut season.

He was shipped out on loan to Spain's Sevilla in 2013-2014, then Italy's Fiorentina and Belgium's Anderlecht in 2014-2015, before heading to Turkey's Trabzonspor this term.

The 27-year-old winger played 24 times, scoring three goals for Ersun Yanal's mid-table team.

Chances of breaking into first-team squad in next couple of seasons - 1/10

Victor Moses has become a perennial loanee whilst remaining on Chelsea's books for the last four years

VICTOR MOSES

Moses embarked on his third loan spell at a Premier League club from Chelsea, after failing to establish himself in west London, having joined from Wigan Athletic in 2012.

The 24-capped Nigeria international featured for Slaven Bilic's West Ham United this season - following his time at Liverpool and Stoke City, respectively - scoring two goals in 26 games in all competitions.

The 25-year-old forward again played a bit-part role as the Irons challenged for a Champions League place.

Chances of breaking into first-team squad in next couple of seasons - 5/10

Charly Musonda played 16 times for La Liga side Real Betis following his loan move to Spain in January

CHARLY MUSONDA

Eight-time Belgium U21 star Musonda helped Chelsea to success in the FA Youth Cup and UEFA Youth League in 2014-2015.

And the 19-year-old attacking midfielder was sent to join La Liga side Real Betis on loan until the end of the season on January 29.

He played 16 times in the Spanish top division; Musonda was named Man of the Match on his professional debut at home to Valencia, and then netted against Deportivo de La Coruna away in the following fixture, but failed to score subsequently.

Chances of breaking into first-team squad in next couple of seasons - 7/10

Nathan scored twice in 18 appearances for Vitesse having signed for Chelsea in a £4.5million deal last year

NATHAN

Brazilian attacker Nathan was another player to join Chelsea's Dutch feeder club, Vitesse.

The 20-year-old midfielder played on 18 occasions in the Eredivisie, bagging two goals in the process.

The Blues had recruited Nathan from Atletico Paranaense for a fee believed to be in the region of £4.5million, on July 1 last year.

Chances of breaking into first-team squad in next couple of seasons - 6/10

Nigeria international defender Kenneth Omeruo - pictured at Middlesbrough last term - was loaned to Turkey

KENNETH OMERUO

Nigeria international defender Omeruo was brought to Chelsea from Standard Liege in January 2012, and was then sent to Holland's ADO Den Haag, before switching to Middlesbrough on loan last season.

This term, the 22-year-old made 24 appearances in all competitions for Kasimpasa, whom he joined on a season-long loan on July 21 last year.

He has picked up 10 yellow cards and scored no goals, while his Turkish team are in seventh with one game to go in the Super Lig.

Chances of breaking into first-team squad in next couple of seasons - 2/10

Danilo Pantic struggled for regular first team football at Vitesse with the 19-year-old featuring just six times

DANILO PANTIC

On July 13, 2015 Pantic signed for Chelsea from Partizan Belgrade for a reported fee of £1.25 million, on a four-year deal, and was immediately loaned out to Vitesse.

The 19-year-old Serbian midfielder featured just six times in the Eredivisie, though, scoring no goals.

Chances of breaking into first-team squad in next couple of seasons - 2/10

Mario Pasalic (right) scored three goals in 16 games for Monaco before back trouble thwarted this season

MARIO PASALIC

In summer 2014, Chelsea announced the signing of Pasalic from Hajduk Split, for a reported fee of £3million, and he was loaned to Elche last season.

This term the Germany-born Croatia international swapped Spain for France as he joined Monaco for a season.

The 21-year-old midfielder scored three goals in 16 Ligue 1 games before his season was thwarted by back trouble in February.

Chances of breaking into first-team squad in next couple of seasons - 6/10

Stope Perica (right) was on loan at Dutch side NAC Breda before being moved onto Udinese in January 2015

STIPE PERICA

Perica signed for Chelsea in August 2013, moving from NK Zadar in his native Croatia.

The Stamford Bridge side then sent Perica to Dutchmen NAC Breda for two seasons, before the forward moved on loan to Udinese in January 2015.

Perica stayed with the Serie A team this season and scored three times in 13 games in all competitions.

Chances of breaking into first-team squad in next couple of seasons - 4/10

Lucas Piazon scored five goals in 27 appearances in all competitions for Championship side Reading this term

LUCAS PIAZON

Chelsea's Young Player of the Year for 2011-2012 was sent to Championship outfit Reading for a season-long loan move on August 31, 2015.

Brazilian forward Piazon's time at the Madejski Stadium became his fourth loan spell away from the Blues, and the 22-year-old found the back of the net five times in 27 appearances in all competitions.

Chances of breaking into first-team squad in next couple of seasons - 5/10

Joao Rodriguez joined Angban at Sint-Truidense but he failed to set the Belgian league alight in 11 games

JOAO RODRIGUEZ

Colombia U20 forward Rodriguez was another Chelsea player to move to Sint-Truidense for a season last summer.

Following spells at Deportes Quindio, Uniautonoma, Bastia, Bastia II and Vitoria, the 20-year-old tried his hand at Belgian football but underwhelmed with no goals in 11 games in all competitions.

Chances of breaking into first-team squad in next couple of seasons - 1/10

Mohamed Salah has been a stand-out performer for Roma and they have triggered the option to buy him

MOHAMED SALAH

In a similar vein to Cuadrado, Salah's move to Chelsea promised much and delivered little.

After just three Premier League appearances in the Blues' title-winning campaign, the now-23-year joined Fiorentina, on transfer deadline day February 2, 2015 for the rest of the season, where he excelled.

Last August 6, Salah - who already has 23 goals in 41 games for Egypt – was again sent to Serie A, this time for a season to Roma.

And the attacker has once more done well in Italy, netting 15 goals in 42 games in total; the Giallorossi activated a clause in the loan agreement to make the move permanent last October.

Dominic Solanke joined Vitesse on a season-long loan and he scored seven goals in 25 appearances

DOMINIC SOLANKE

At just 18 years old, and already with three England U21 caps having played at every international level since U16, Solanke is one of the brightest young strikers in the country.

On August 4, 2015, Solanke joined Vitesse on a season-long loan to gain first team experience and he repaid the Dutch club with seven goals in 25 games, despite his tender age.

Chances of breaking into first-team squad in next couple of seasons - 7/10

John Swift continued his development at Championship level with Brentford this term making 27 appearances

JOHN SWIFT

Swift was part of the squad that won the 2013-2014 Barclays U21 Premier League. Following spells at Rotherham United and Swindon Town last season, on October 1 last year he was given the chance to prove himself in the Championship with Brentford.

The 20-year-old box-to-box midfielder enjoyed an impressive season as the Bees finished ninth, and Swift scored seven goals from 27 league matches.

Chances of breaking into first-team squad in next couple of seasons - 6/10

Marco van Ginkel struggled to break into the first team at Stoke but he has enjoyed more success at PSV

MARCO VAN GINKEL

Dutch midfielder Van Ginkel spent the first half of the 2015-2016 season on loan at Premier League side Stoke City before switching to PSV Eindhoven in the Eredivisie, on February 1.

In 21 games in all competitions for Stoke, the 23-year-old failed to score, but his fortunes changed in Holland as he scored eight times in just 15 matches.

PSV were crowned champions of their league, while Stoke came ninth.

Chances of breaking into first-team squad in next couple of seasons - 6/10

Brazilian full back Wallace (right) returned to his native Brazil with Gremio after struggling at Carpi in Italy

WALLACE

Brazilian full back Wallace enjoyed the second half of the season on loan in his homeland with Gremio after an unsuccessful spell at Carpi in Serie A during the first half of the campaign.

On July 22, 2015, Wallace joined the newly-promoted Italian side (who were eventually narrowly relegated) on a season-long loan but after just six league appearances that was not completed.

He then headed back to South America (Chelsea signed him from Fluminense) for an 18-month period and the 22-year-old has featured nine times for them so far.