Manchester United defeated Chelsea 2-1 at Old Trafford on Sunday despite Chelsea scoring the first goal.
Willian put the Blues in front, but Romelu Lukaku equalised before half-time, and Jesse Lingard scored the winner in the second half.
Jose Mourinho praised Chelsea after the game as he admitted that his side defeated a difficult team.
“We beat a fantastic team, for some reason they were the champions last season,” Mourinho told Sky Sports.
“For some reason, they played the way they did against Barcelona.
“For some reason, they start the game so well as they started here.
“We beat a very good team, to beat a very good team you need to be organised but you also need to have a humble spirit where everybody works, everybody fights, everybody tries to follow a game plan.
“I repeat, we beat a very good team.”