Chelsea have told Barcelona and Bayern Munich that Andreas Christensen is not for sale and will be a part of their first-team plans for the 2017-18 season.

The 20-year-old Denmark defender has starred while on loan at Borussia Monchengladbach this term, sparking interest from the European giants.

Christensen joined the German club on a two-year loan last summer and such is his progress in the Bundesliga, Chelsea considered cutting the deal short and bringing him back for next season.

He has made 34 appearances in all competitions, including noteworthy performances against Manchester City, Juventus and Sevilla in the Champions League group stages.

Barcelona and Bayern have been tracking his progress and were hoping to lure him away from Stamford Bridge, while Borussia have also made it clear they’d like to sign the player on a permanent basis.

However, Chelsea, who opted against recalling him from Germany prematurely as there is a real chance he would only be third or fourth-choice in his position next season, have decided the centre-half is not for sale and will be a part of their future plans.

The Chelsea hierarchy have also been impressed with his progress and believe another year of regular first-team football at Borussia will mean he is ready to compete for a place in the senior side the following campaign.

Christensen, who made three appearances under former Blues manager Jose Mourinho last season, still has four years left on his Stamford Bridge contract.

Meanwhile, Chelsea could be boosted by the return of five key players for the visit of Manchester City on Saturday.

The players Antonio Conte wants to transform Chelsea this summer 13 show all The players Antonio Conte wants to transform Chelsea this summer 1/13 Chelsea's new manager signed a three-year contract worth £14.3m after tax. But which players will the 46-year-old look to bring in?



Scroll through Standard Sport's gallery to find out more about Conte's potential transfer targets. Srdjan Stevanovic/Getty Images 2/13 Romelu Lukaku The Belgium international left Chelsea for Everton in a £28m deal just two years ago after growing frustrated over a lack of first-team opportunities but could be set for a sensational return.



Chelsea are prepared to pay as much as £67m to seal the Belgian’s return to Stamford Bridge, with Everton holding out for as much as £75m.



However, Standard Sport understands that Lukaku could yet submit a transfer request to force through the move. Chris Brunskill/Getty Images 3/13 Diego Lopez Chelsea have been looking at potential replacements for Asmir Begovic and held talks with Marseille keeper Steve Mandanda, only for him to opt for Crystal Palace because he was told he would be their No.1.



The Blues are now looking at the experienced Lopez, who made only nine appearances for AC Milan last term after losing his place to teenager Gianluigi Donnarumma. Valerio Pennicino/Getty Images 4/13 Alvaro Morata Chelsea made a move to sign the Spaniard at the beginning of June but must now wait until after Euro 2016 as the striker ponders his future. Real Madrid have activated a buy-back clause inserted into Morata's contract when he left the Bernabeu for Juventus in 2014. But it is understood the Spanish giants will then look to again offload the 23-year-old for a sizeable profit. (David Ramos/Getty Images) 5/13 Kalidou Koulibaly Conte wants a centre-half and Koulibaly is his main target despite Napoli saying they want the 25‑year‑old to stay.



But the club fear they will have to pay in excess of £50million to sign Kalidou Koulibaly from Napoli – and smash the British transfer record for a defender. Maurizio Lagana/Getty Images 6/13 Graziano Pelle After securing the signing of Belgian striker Michy Batshuayi, Conte will look to bring Italy striker Pelle to Stamford Bridge. Claudio Villa/Getty Images 7/13 Radja Nainggolan Chelsea had hoped to have concluded a deal for Roma’s Belgian star in a £31million deal, but Standard Sport understands that they have started looking at alternate targets, such as Leicester City’s N’Golo Kante, after growing frustrated by negotiations. Getty 8/13 Leonardo Bonucci The Juventus defender hugely admired by Conte, who he coached at Juventus between 2011-14 and has coached him for the past two years in the national team Marco Luzzani/Getty Images 9/13 Mauro Icardi The Inter Milan captain, still only 23, would be the younger striking option that Conte could favour alongside a more experienced man up front. Despite snubbing a move away from the Nerazzurri and signing a new deal at Inter last summer, the former Chelsea target could be encouraged to come to England with the prospect of a salary increase especially as Inter are struggling to secure Champions League football for next season. Tullio M. Puglia/Getty Images 10/13 Paul Pogba The France international has been on the radar of Europe's top clubs for some time now, but rejected a move away from Juventus last summer after saying it wasn't the right time to depart. Only a big money move would tempt Juve to part with their prized asset and if Chelsea do not secure Champions League football for next season, a transfer for Pogba would prove difficult. 11/13 Edinson Cavani The Uruguay striker could be the experienced forward Conte is looking for, and will also be a viable option as PSG are thought to be ready to listen to offers for the 29-year-old. Cavani would arrive to Chelsea in good form too - he's scored 17 goals in all competitions this season, including the winning strike against Chelsea in the Champions League last-16 first-leg in February. FRANCK FIFE/AFP/Getty Images 12/13 Gonzalo Higuain Higuain has also attracted interest from Arsenal during recent months but Napoli president Aurelio De Laurentiis has always warned that interested parties will have to pay the striker’s £65.8m buyout clause to get hold of him. (Maurizio Lagana/Getty Images) 13/13 Kostas Manolas Chelsea have made a fresh enquiry for Roma's Kostas Manolas, who has been earmarked as a replacement for captain John Terry in the back four. (Paolo Bruno/Getty Images) 1/13 Chelsea's new manager signed a three-year contract worth £14.3m after tax. But which players will the 46-year-old look to bring in?



Scroll through Standard Sport's gallery to find out more about Conte's potential transfer targets. Srdjan Stevanovic/Getty Images 2/13 Romelu Lukaku The Belgium international left Chelsea for Everton in a £28m deal just two years ago after growing frustrated over a lack of first-team opportunities but could be set for a sensational return.



Chelsea are prepared to pay as much as £67m to seal the Belgian’s return to Stamford Bridge, with Everton holding out for as much as £75m.



However, Standard Sport understands that Lukaku could yet submit a transfer request to force through the move. Chris Brunskill/Getty Images 3/13 Diego Lopez Chelsea have been looking at potential replacements for Asmir Begovic and held talks with Marseille keeper Steve Mandanda, only for him to opt for Crystal Palace because he was told he would be their No.1.



The Blues are now looking at the experienced Lopez, who made only nine appearances for AC Milan last term after losing his place to teenager Gianluigi Donnarumma. Valerio Pennicino/Getty Images 4/13 Alvaro Morata Chelsea made a move to sign the Spaniard at the beginning of June but must now wait until after Euro 2016 as the striker ponders his future. Real Madrid have activated a buy-back clause inserted into Morata's contract when he left the Bernabeu for Juventus in 2014. But it is understood the Spanish giants will then look to again offload the 23-year-old for a sizeable profit. (David Ramos/Getty Images) 5/13 Kalidou Koulibaly Conte wants a centre-half and Koulibaly is his main target despite Napoli saying they want the 25‑year‑old to stay.



But the club fear they will have to pay in excess of £50million to sign Kalidou Koulibaly from Napoli – and smash the British transfer record for a defender. Maurizio Lagana/Getty Images 6/13 Graziano Pelle After securing the signing of Belgian striker Michy Batshuayi, Conte will look to bring Italy striker Pelle to Stamford Bridge. Claudio Villa/Getty Images 7/13 Radja Nainggolan Chelsea had hoped to have concluded a deal for Roma’s Belgian star in a £31million deal, but Standard Sport understands that they have started looking at alternate targets, such as Leicester City’s N’Golo Kante, after growing frustrated by negotiations. Getty 8/13 Leonardo Bonucci The Juventus defender hugely admired by Conte, who he coached at Juventus between 2011-14 and has coached him for the past two years in the national team Marco Luzzani/Getty Images 9/13 Mauro Icardi The Inter Milan captain, still only 23, would be the younger striking option that Conte could favour alongside a more experienced man up front. Despite snubbing a move away from the Nerazzurri and signing a new deal at Inter last summer, the former Chelsea target could be encouraged to come to England with the prospect of a salary increase especially as Inter are struggling to secure Champions League football for next season. Tullio M. Puglia/Getty Images 10/13 Paul Pogba The France international has been on the radar of Europe's top clubs for some time now, but rejected a move away from Juventus last summer after saying it wasn't the right time to depart. Only a big money move would tempt Juve to part with their prized asset and if Chelsea do not secure Champions League football for next season, a transfer for Pogba would prove difficult. 11/13 Edinson Cavani The Uruguay striker could be the experienced forward Conte is looking for, and will also be a viable option as PSG are thought to be ready to listen to offers for the 29-year-old. Cavani would arrive to Chelsea in good form too - he's scored 17 goals in all competitions this season, including the winning strike against Chelsea in the Champions League last-16 first-leg in February. FRANCK FIFE/AFP/Getty Images 12/13 Gonzalo Higuain Higuain has also attracted interest from Arsenal during recent months but Napoli president Aurelio De Laurentiis has always warned that interested parties will have to pay the striker’s £65.8m buyout clause to get hold of him. (Maurizio Lagana/Getty Images) 13/13 Kostas Manolas Chelsea have made a fresh enquiry for Roma's Kostas Manolas, who has been earmarked as a replacement for captain John Terry in the back four. (Paolo Bruno/Getty Images)

Forward Eden Hazard has resumed training after missing the last five weeks with a hip and groin injury, while Willian and Gary Cahill, who have both missed two games, and Nemanja Matic (one match) are back after being sidelined with minor niggles.

Striker Diego Costa will also be able to lead the Chelsea line following a three-game ban.

