Premier League big boys Chelsea and Man Utd are on alert following the recent comments from the agent of Tottenham star Toby Alderweireld.

The Belgian centre-back, who was arguably the best centre-back in Premier League last season, has only two years left on his current contract and he hasn’t been offered an extension yet by Spurs.

Alderweireld’s agent Stijn Francis has demanded that Spurs should either make his client one of the best-paid players at the club or sell him.

“Toby is always good,” Francis told Belgian newspaper Het Nieuwsblad.

“Even after his injury he recovered well. Tottenham’s statistics fell sharply during his absence.

“If you only look at his figures, Toby is impressive and for his performances, he deserves either a correct contract from Tottenham or a transfer.

“For a transfer, you know that he can only leave Tottenham for seven or eight teams and almost all the other top clubs are interested in Toby.

“There are not a lot of central defenders of his kind so they are sought after. But those clubs also know that they have to negotiate with [Tottenham chairman] Daniel Levy.”