Tottenham Hotspur have long suffered with problems at left-back, but this season that spot in the team is one of the most hotly contested positions in the starting line-up.
Danny Rose started the season as the club's first choice, but an injury to the jet-heeled defender has provided Ben Davies a chance to show what he can do in the first-team.
Davies signed from Swansea City for a fee of around £10 million, but he has had to bide his time for a shot in the first-team.
Since breaking into Pochettino's line-up, the Welshman has gone on record to state that he feels he has made a solid start, but it still may not be good enough for him to hold down a first-team place when his main rival returns to fitness.
Davies has actually been way behind Rose in a number of areas of his game and has only confirmed Pochettino's view that he is currently second choice.
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Although the 21-year-old still has time to develop, he will need to progress quickly if he is to reach Rose's standard.
So far, Rose has made more tackles, won more headers and been more proactive in his defending, regularly intercepting opposition attacks.
Davies was actually considered the more capable defender of the pair, given Rose's natural attacking instincts, but he is yet to show this part of his game at White Hart Lane.
It highlights just how much further the Welsh international has to go before becoming a regular starter at his new club, but Pochettino will hope that the competition in the squad will drive both his current left-backs on to new heights.