By Editor Wayne Veysey | Former Evening Standard, Press Association and Goal chief correspondent with 18 years experience of breaking big stories, including exclusives like this

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Tottenham are confident of tying Jan Vertonghen to a new contract worth £17.5million, Football Insider sources understand.

Spurs are in talks with the Belgium international about an improved four-and-a-half-year deal that will lift his salary to around £75,000-a-week.

A Tottenham source has told Football Insider that tying Vertonghen down to fresh terms is a priority as they work on a round of contracts for their key players.

Vertonghen, 28, is currently sidelined with knee ligament damage that could keep him out for another month but he is a mainstay of the team and has been outstanding this season alongside Toby Alderweireld in the centre of defence.

His deal expires in the summer of 2018, but Spurs want to extend the deal until 2020.

Spurs have previously cashed in on their prized assets, such as Dimitar Berbatov, Luka Modric and Gareth Bale, but manager Mauricio Pochettino wants to keep the current squad together and develop a youthful and hugely promising group of players.

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Target men: Pochettino is keen to tie Spurs’ key players to long-term deals

Spurs qualified for the last 16 of the Europa League on Thursday and return to Premier League action on Sunday, when they host Swansea in the Premier League.

Other than simply keeping the squad together for Pochettino, Tottenham chairman Daniel Levy is well aware that the likes of Vertonghen and Christian Eriksen will be more valuable if they are tied to longer contracts.

In other Tottenham news, the Londoners are also closing in on a new agreement for Eriksen.