The French defender says their confidence has returned after victory over Swansea City.
"I think the confidence is back. After the draw against Chelsea and the victories against Bolton and Swansea, the confidence is back," the defender told Tottenham's official website.
"Now, like I said to everyone, every game is a final for us. We have to be strong if we want to finish third.
"We have to play every game with 100 per cent, and at the end of the season we will go on our holidays and feel that maybe we deserved to finish third.
"Before that we have to give everything. Before the game we have to speak together and we have to know that we are not tired, and that we can be tired at the end of the season."