Davies has played in 24 of Spurs' 29 Premier League matches this season

He was considered an understudy for club and country, but now it is safe to say Ben Davies is one of the first names on the teamsheet for Tottenham Hotspur and Wales.

Once described by a TV presenter as Tottenham's "go-to guy in the Europa League," Davies is now established as one of Spurs' key defenders.

So how did Davies manage to dislodge England full-back Danny Rose as Spurs' first choice fullback?

How did Davies go from being on the outside to being described by BBC Sport's Garth Crooks, himself a former Tottenham striker, as "outstanding," in his latest team of the week?

"His all-round performance was outstanding," he said of his display against Huddersfield. "If I were fellow Spurs full-back Danny Rose I'd be somewhat concerned," he added.

Ahead of what would be a 150th Premier League appearance for Davies against Bournemouth on Sunday and Spurs' huge Champions League clash with Juventus, BBC Sport Wales takes a look at what has gone right for the man from Ystalyfera.

Ben Davies made his Swansea debut in 2012

Nearly always available

Davies' career so far has been notable for the fact that aged 24, the Welsh left back has only suffered three injuries in his whole career that have sidelined him for longer than a week.

That contrasts with the problems faced by Spurs teammate Rose, who missed close to ten months of action with a knee injury between January and October.

Davies' eagerness to play and availability is in fact how he made his mark in the game. His first chance at Swansea came during a pre-season tour in 2012 when first choice for the Swans and Wales, Neil Taylor, was away on international duty with Team GB in the Olympics.

Davies was only a youth team player, but did enough to start the season playing Premier League football.

Davies made his Wales bow in the same season and went on to play 44 games for the Swans.

A year later, and firmly established with Wales, Davies switched to Spurs in a swap deal that took Gylfi Sigurdsson back to the Liberty Stadium.

It was, in fact, one of the first transfers to be sanctioned by Spurs' new boss, Mauricio Pochettino.

Pochettino's philosophy was that full-backs would be such a key component to Tottenham's style that there would be a need for almost constant rotation.

However, for a long time, there could be no denying that Davies was very much second choice behind Rose, just as on the right flank Kyle Walker was the number one, ahead of firstly Kyle Naughton and then Kieran Trippier.

That, however, was then.

The phenomenal clearance that started Wales' Euro 2016 run

Rose injury and newspaper controversy

Davies played second fiddle to Rose at White Hart Lane for around 18-months, until Rose injured his knee at Sunderland in January 2017.

Davies played every Premier League game from that moment on for the rest of the season and has barely looked back at Spurs since.

By the time Davies got a prolonged run in Tottenham's team, he had already established himself as a key component of Chris Coleman's Wales side that stunned the footballing world by reaching the semi-finals of Euro 2016.

In fact, Davies' amazing goal-line clearance in Wales' opening win over Slovakia really set the wheels in motion for Wales' phenomenal run.

However, while he was established in the red of Wales, for Spurs it was a different story.

Davies had played just seven of 18 Premier League games before Rose's injury on 30 January, having featured in just 17 of 38 matches in the 2015/16 season and only making 14 starts in his debut campaign as a Lilywhite.

Davies' recent run in the Spurs side coincided with their best form of last season, with no side accruing more Premier League points between February and May as they finished second in the Premier League.

With Rose unable to return for the start of the season, Davies was always likely to keep his place in Tottenham's first XI, but his run this year has almost eradicated rotation at Spurs in the left back spot.

Davies has played in 24 of Spurs' 29 Premier League matches, with Rose picked only five times.

That contrasts the right back situation, where Trippier (16) and Serge Aurier (13) have shared game time with Walker sold to Manchester City.

It should be noted, however, that Davies' case has probably been helped by the furore caused by Rose's comments to the Sun newspaper on the eve of the season where he openly questioned Tottenham's ambitions and pay structure.

Spurs boss Pochettino quickly declared the matter settled after Rose apologised, but many Spurs fans believe Rose is still paying the price for his words.

Ben Davies grew up in Wales and Denmark

No longer the defensive left back

Conventional wisdom for a long time in the stands at White Hart Lane was that while Davies was possibly a stronger defensive option than Rose, there was little doubt the England defender was better going forward. BBC Sport's Jermaine Jenas was one pundit who expressed that viewpoint.

However, the stats do not back up the assertion that Davies is inferior to Rose as an attacking full back or wing back.

Davies (14) leads Rose (13) in career assists after providing the winner for Harry Kane in the latest North London derby.

Not only does Davies top Rose for assists in his career, but he has also managed five this season, the fourth most of any defender in the Premier League, as well as scoring twice.

For context, only Christian Eriksen and Dele Alli have created more Spurs goals this term.

Spurs also perform better defensively with Davies in the side and have a higher win percentage when he starts than when he does not. All these factors have led to his manager describing him as "one of the best left backs in the Premier League."

There can be no doubt, therefore, that for club and country Davies has become absolutely key.