The 26-year-old, who was at the centre of one of last summer's most protracted transfer sagas over a move to Chelsea which did not materialise, will wait until after the European Championship to make any decisions.
The Croatia international told the Daily Mirror: "I will decide about my future after the Euros.
"I will make the decision where to continue my career. I'm ready for the big tests."
Tottenham's participation in the Champions League next term depends on the result of this season's final, as Chelsea will take the fourth available spot if they beat Bayern Munich on Saturday.