Mourinho admits Premier League title race 'probably' over after Manchester derby defeat
Goals from David Silva and Nicolas Otamendi, either side of Marcus Rashford's equaliser, secured City's 14th win in succession, an English top-flight record in a single season.
Mourinho was enraged by referee Michael Oliver booking Ander Herrera for diving late on as the Spaniard tumbled over Otamendi's challenge in the penalty area - a moment laced with mirth given the Portuguese's pre-match accusations over City's simulation.
But Mourinho believes City are being "protected by luck" in their march to the top of the league - a factor he thinks could help them lift the trophy.
Asked by BBC Sport if the title race was run, Mourinho said: "Probably, yes.
"Manchester City are a very good team and they are protected by the luck, and the gods of football are behind them.
"I'm pretty sure everyone is going to fight for points and try and reduce the distance, but the advantage is a very good one."
Both of City's goals came from United's failure to clear set-pieces as Mourinho saw his team cede large amounts of possession to Guardiola's men.
He added: "Two bad goals. Not what you expect to concede. City have good qualities. They have a huge percentage of ball but their creation we kept control of.
"We did enough to win the game? It depends on your perspective. They had more of the ball and apparently more control because they kept the ball more than us. But I think the players fought enough.
“Without any analysing the match is made of incidents and the penalty was a big incident."
