"United were not the best team on the pitch," he said after Chelsea's 40-match league unbeaten run came to an end.
"I hope they can realise why Chelsea are champions, top of the league and I believe will be champions again.
"I think the difference between us was only luck to be fair."
"I finished the game in Seville with a very bad taste but I am proud of my players and not afraid of the future," added Mourinho.
"I don't think we deserved to lose today but I give them credit for the way they defended.
"We are disappointed but it's one thing to lose after a very bad performance and another to lose after a good game of football."
"When Arsenal lost here the difference was small and they were very close to the other opponents but at the moment we still have a comfortable distance between us and the others," said Mourinho.