Chelsea are struggling to reproduce their flying form like early in the campaign, according to Premier League legends Jamie Carragher and Thierry Henry.
The west London side threw away a two-goal lead at the KC Stadium on Sunday before Loic Remy came off the bench to secure the win.
Mourinho's side are still in pole position to seal the title but Carragher and Henry think they lack something as they look a different side compared to how they started the season.
“I think even just watching Jose Mourinho’s interview, even he doesn’t look himself,” Carragher told Sky Sports.
“They’re still winning, they’re the best team in the league, they’re going to go on and win the league but the Chelsea we remember from the start of the season, we were waxing lyrical about them – Fabregas, Oscar, the football they were playing.
“They still won today and that’s the difference, they haven’t been great today, they haven’t been poor but they’ve won that game, maybe other top sides like Manchester City wouldn’t have won that game.
“They dominated the second half and deservedly won but there is a bit of a spark missing from them, maybe they just want to get the title won, they don’t really care how they’re playing.”
While Arsenal legend Henry added: “I think it is just the expectation.
“Everybody thought they were going to go and win the treble.
“Sometimes as a player when you’re thinking about winning the Champions League, when you get what happens to them against Paris Saint-Germain you get a little moment where, I’m not saying that you doubt yourself but you are trying to find rhythm.
“But at the end of the day, if they win the league and they won the Capital One Cup, that is still an amazing season.”