Southampton legend Matt Le Tissier is convinced the Blues are "hot favourites" to qualify for the quarter-finals of the UEFA Champions League, but need to produce a better performance in the second leg against Paris St Germain.
Chelsea took the lead when Branislav Ivanovic's header found the back of the net in the 36th minute but Laurent Blanc's side responded after half-time through Edinson Cavani.
The clash at the Parc des Princes ended 1-1 on Tuesday night, with Mourinho's team having an advantage ahead of the second leg and former Saints striker says Chelsea cannot afford to be complacent.
“Chelsea are pretty hot favourites but there can be no complacency because PSG have got some very good players in their team,” Le Tissier told Sky Sports.
“I think this is an excellent result for Chelsea and it is in their favour when you consider last year they were 3-1 down and still went through. But PSG will still be dangerous on the counter at Stamford Bridge.”
“They weren’t that adventurous but they didn’t park the bus,” he added.
“It was a solid and disciplined defensive display.
“Chelsea had to be disciplined and they got the away goal. They never committed many men forward except from set pieces when defenders would go up, but PSG are too good to try and snuff out the tie in one evening.”