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Where there have been issues in regards to Vertonghen (and he is not alone here), it has been in his ability to adhere to the shape and structure of the team, and how they respond when pressured.
Tottenham's worst moments defensively have come through disorganization and a lack of awareness as to what is going on around on them.
Vertonghen has not been one of the worst culprits here, but he has been just as susceptible in these instances and unable to make up for slackness elsewhere.
More positively, Vertonghen has deputized solidly for the injured Benoit Assou-Ekotto.
There have been occasions when he has been left isolated by Gareth Bale, or the Belgian himself has been caught out of position.
Mostly though, Vertonghen has proved a reliable presence there, on hand as an outlet for his teammates and in defending down that left wing.
Spurs' use of wingers means that it is not so imperative that the team's full-backs become (and sometimes instigate) part of attacks.
This is not to say they can't (as seen by Kyle Walker down the right), but Vertonghen is identifiably a supportive left-back rather than one with wing-back tendencies so synonymous with the role of the modern full-back.
Rather than heading to overlap the winger in front of him, he will sit just off of him and judge as appropriate those times he needs to move inside or outside as an option, or remain back.
While Vertonghen and Bale have not quite found a regular chemistry to their partnership down the left flank, it has worked together well enough and on occasion worked extremely well (see their combining for Spurs' opener in the win against Manchester United).