It is the second earliest date that the Premier League title has been sealed and City could still set several records before the end of an impressive campaign.
"We always gave them the opportunity to be solid, compact, together with huge physical strong players, they always had time to organise themselves".
Pep Guardiola's men could have won the title last week but Mourinho's side stunned City at the Etihad in a thrilling 3-2 win.
This unlikely scenario caused much amusement for some.
Other players, analysts and broadcasters congratulated the champions, with varying degrees of joy and despair.More news: Putin & Erdogan vow more cooperation on Syria after US-led airstrikes
"It's incredible the way we played and I am so glad to be here and be part of this club", he said on the club's website.
"Then the first time you lose one, you think you're never going to win another ever again", he told Sky Sports. A 16-point lead with five games to play and 93 goals scored represents an emphatic response, not that any doubts ever existed inside the City dressing room. "I know how to win, I believe in myself but I don't play", added the former Chelsea and Real Madrid manager. That's Liverpooling more than Liverpool have ever Liverpooled this season.
"This is not a dynasty, it is one title we've won". It is hard to speak about Manchester City for me, but what Pep Guardiola has done is unbelievable; to win the title with the football he plays is great.
"Eight titles are eight titles and three Premier Leagues are three Premier Leagues".
Asked if he was frustrated because City won the title on the back of United's loss, the Portuguese said, "I have won titles, I would not be happy if someone said I won title because someone lost a match. I have never retained a title so I want to see if this team's got it to carry on and be even more successful". Probably because I won eight championships, I was not in the moon with the victory against them.