The midfielder only moved to White Hart Lane last summer from Toulouse but has struggled to show his best form.
He has been linked with a move to Napoli, but his representative has said that Spurs are holding up the deal with unrealistic demands, with The Mirror claiming that they want £12m.
"The problem is not the player or Napoli – Tottenham just want a lot of money. What they're asking for is absurd. But we are only on January 21, and there is still hope," Martha Fischer is quoted as saying by the newspaper.