Paul Robinson says it is clear to see that Tottenham defender Jan Vertonghen does not enjoy playing as a left-back any more.

The former Spurs and England goalkeeper, speaking exclusively to Football Insider, says that his old side have a problem when it comes to the full-back positions and that the Belgian enforcer cannot be trusted to fill in as a makeshift option.

Vertonghen lined up on the left-hand side for five successive league games before Christmas, manager Jose Mourinho moving him back to the centre as part of a back three for the last two matches.

Robinson suggests the change of formation comes from the problems on either side of the defence and says it was obvious Vertonghen was not happy with his makeshift role.

Robinson told Football Insider: “I think he started with three at the back because of the full-back situation. The full-backs have been a problem all season.

“Vertonghen now, as he’s getting older he’s not enjoying playing left-back, you can see he’s not enjoying playing left-back.

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“Vertonghen’s not the answer at left-back long term.”

Vertonghen has had a tumultuous season for Tottenham so far, former manager Mauricio Pochettino leaving him out of the side for the opening three weeks of the campaign.

Having returned to the starting XI, he then missed three more Premier League games as a result of a muscular injury, stepping back in as a left-back at the end of November.

Mourinho has used Ryan Sessegnon as a left-sided wing-back for the Lilywhites’ last two games, with Ben Davies injured and Danny Rose left out completely of the matchday squad.

In other Tottenham news, Danny Mills suggests that Mourinho believes a first-team talent suffers from “mental weakness”.