PSG kept alive their hopes of retaining the league with a 4-0 thumping of Reims on Sunday thanks to goals from Neymar, Kylian Mbappe, Marquinhos and Moise Kean.
Lille’s failure to beat Saint Etienne means the destination of the league title will not be decided until next Sunday.
The Parisians are one point behind Christophe Galtier’s men, who travel to Angers on the final day while PSG are away at Brest.
PSG will take on AS Monaco in the French Cup final in midweek before switching their attention to the league.
"The most important thing is to believe [in our chances]," Pochettino said post-game.
"But now we have to focus on Wednesday's [Coupe de France] final against Monaco. That's our first objective. Then after the French Cup final we will focus on our game against Brest.
"The important thing is that we still have a chance to win the league. We have to do our job and see what Lille do against Angers.
"Sometimes you need a little luck and think it was a penalty and unfortunately a red card for Reims. That's football, sometimes the luck goes your way, and tonight it went our way.
"I think we deserved the victory and the three points that put us in a position to fight with Lille until the very last game."
