A 73rd-minute header from Jay Rodriguez after United had failed to defend a corner won the game for relegation-threatened West Brom and Mourinho said his team had not played the simple football he expects.
After starting the title party with his Mancunian wife and his United-supporting father-in-law, City captain Vincent Kompany joined team-mates to raise a glass to their success. All the lads have done so well and it feels great to be a part of this really special group of players! "So happy to be able to share another trophy with our wonderful fans", the 32-year-old Belgian defender said on Twitter.
Had they won it last week against United, that would have defined Guardiola's first title, but City have been so much more than that this season, which is why the long-term uplift of sealing it as they have will do them no harm.
"We've won you the league, Manchester City, we've won you the league", sang West Brom's fans near the end of the game. I think with my experience you don't win titles with inconsistency.
"They always had time to organise themselves".
Their fans, who had celebrated the comeback victory at the Etihad last week, booed Jose Mourinho's side off the field after they lost to a team who had not won since January. I understand how to win.
City need just nine points from their final games to set a new record for most Premier League points, while another 11 goals would see them set a new goal-scoring record. "If I was in their position I would be very upset if someone said they won because United lost against West Brom".
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As sweet as such a triumph would have been - United's 3-2 win, after being 2-0 down, denied their neighbours the title that day - the emphasis placed on being crowned champions by defeating their bitter rivals might just have overshadowed the true magnitude of City's third domestic championship in six years.
Winning the title with five matches to go makes City the joint earliest champions in the Premier League era - matching the achievement of the 2000-01 Manchester United team.
"We did it! An incredible journey to get here".
This is how Manchester #United lose the #Premier League title race, not with a fight but with a whimper.
"It hurts [for Manchester City to win the title]".
Right-back Kyle Walker, who joined Man City last summer, said: "We did it!" "It's one of those days that we didn't play good enough and we tried to create some chances in the first half and in the beginning of the second, but we didn't play quickly enough".