Manchester United went behind after just 30 seconds when Pedro capitalised on slack defending before Gary Cahill smashed in the second after the Red Devils allowed Eden Hazard's corner to bounce in their box.
They fell further behind when Hazard drilled in a precise 15-yard strike after the break, and N'Golo Kante sealed the victory when he skipped around a static defence to slot in.
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Zlatan Ibrahimovic look dejected after the defeat
And Mourinho admitted his side just weren’t at the races today.
"It started badly after a few seconds. We are close to the 1-1 and after another defensive mistake and it is 2-1,” Mourinho said.
"You come with a strategy, you can not concede a goal in the way we did.
"We were coming to have an offensive approach, we wanted to create chances, we showed that after the 1-0. The second and the third were counter-attack goals. If we score a goal like we almost did for the 2-1 the game would be different.
"It is one of those days when you give the advantage to opponents by doing nothing.
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Chelsea are now just a point off the top of the Premier League
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"We made incredible defensive mistakes, individual mistakes and you pay for that.
"In terms of points, we got zero points, we lose three points. We are six points from the top, three from the top four, we now need to win matches.
“We need to win our matches now, which are not easy, we need to win to close that gap, after these last three matches, we made two out of nine, we now need points.”
