The Frenchman is nearly an ever present in central midfield for Spurs this season.
He impressed in their 0-0 draw with Chelsea at Stamford Bridge on Sunday, which took the team back to the top of the table.
"Well, I can say on everything," said Sissoko told Stadium Astro about Mourinho's impact on his game.
"Defensively, offensively or even mentally I am more stronger.
"I try to be all the time alert of the game and try to read the game. I think I learn a lot of things and then we all learn since he came.
"When you have a manager like him, you can always improve, so let's keep going in that direction because there are still a lot of things to do."