But Villas-Boas says that the midfielder, 26, who joined Spurs from Dinamo Zabreb in 2008 for a reported £16m, is the subject of renewed interest from other clubs and negotiations are ongoing.
He said: "The interest that we have from various different clubs shows the importance of the player and what he's done for Tottenham.
"It's fair to say that the club respects Luka's ambitions and his willingness to move on and he respects the fact that he's an important player for the club and can help us move forward.
"Ongoing discussions will continue with these clubs until we reach an agreement which is acceptable for each party."