Mourinho does not think Chelsea will slip up and can be caught, after his side kept pace with the top four.
United won 2-0 against Watford, thanks to goals from Mata and Martial and are just one point off the top four.
Chelsea visit Burnley on Sunday and with 14 games left in the league Mourinho does mot think they can be caught.
Mourinho told Sky Sports when asked if United themselves can catch Chelsea: “Honestly I don’t think so. Why? Because Chelsea are a very good defensive team, they defend very well and defend with lots of players, very good players, and are very well organised.
“I think in this situation, a very defensive team wins the title with counter-attack goals, set pieces goals, and individual goals from talented players. So I don’t think they’re going to let it slip.
“But football is football, you never know.”