Mourinho is convinced Paris Saint-Germain will see a different Chelsea, compared to the side that lost 3-1 to Laurent Blanc's team at the Parc des Princes, in the Champions League quarter-finals last season.
The Blues went through to the semi-final after winning on the away goals rule, following PSG’s 2-0 defeat in the return leg at Stamford Bridge.
Former Chelsea defender David Luis who moved to PSG last summer also believes the west London club are a better team this season but the Portuguese isn’t bothered about what the opposing team thinks, channelling his focus on the game.
"I'm not here to comment what opponents say, even being David. I don't want to comment,” he said.
"We beat them, but we lost. And we lost in Paris and again knockout competition was decided in the last minute. A detail makes a difference.
"I'm not saying we won because we were better than Paris. We won because we scored a goal away and we didn't concede at home.
"Paris are a great team and are basically the same team as last season, with David Luiz. Same team, same coach, same dynamic, same profile.
"They have conditions to be better. When you have stability you can always improve. Chelsea are a different team. We have some different players, we change a little bit the profile of our game, the identity of our game.
"I don't want to say we are better or not better. I'm saying that we change the profile of our game, so I believe that tomorrow Parc des Princes will see a different Chelsea than last season."