Neil Warnock's Crystal Palace side take on Chelsea this weekend, hoping the Eagles can win a second successive game over Mourinho's side.
Tony Pulis was in charge last season when a John Terry own goal dealt Chelsea's title chances a cruel blow, and Warnock's team face an even tougher test now.
Chelsea are much improved, mainly from two key summer additions, Diego Costa and Cesc Fabregas.
Fabregas is a player Neil Warnock has come up against before, when he was with Arsenal, and feels the Spaniard is a far superior midfielder nowadays, and a greater threat.
He told The Telegraph: “Fabregas was a great player at Arsenal but I think he’s matured since.
"He’s so much more decisive now, there’s an end product to his game whereas at Arsenal I didn’t think there was as much.
"He’s almost got the complete midfielder’s package now."
With seven assists in seven Premier League games this season, it's hard to disagree with Warnock's comments, the only question is whether the Palace boss can work out a way to stop him?