Jose Mourinho's side had kept the title race just about alive with a dramatic 3-2 derby win in their previous game, but a dismal performance against the league's bottom club means they can not now finish higher than second place.
Mourinho insisted it was not United's loss that had given the title to City, adding: "Manchester City won the title because they won more points than everybody else, because yesterday they won against Tottenham, because during the season they lost only two matches". Rodriguez headed home for West Brom, with United's 1-0 defeat seeing City seal the title without kicking a ball.
They clinched the silverware 24 hours later thanks to West Brom forward Jay Rodriguez´s 73rd minute header at Old Trafford although Guardiola may have missed the crucial moment after opting for a round of golf with his son instead.
Herrera had a penalty appeal waved away after seemingly being tripped by Craig Dawson, while Lukaku's powerful drive from Juan Mata's through ball was kept out by the face of Foster.
United's comeback at the Etihad from a 2-0 half-time deficit offered their supporters a rare fillip of flair and excitement after a hard season where their style of play has hardly endeared Jose Mourinho to the club's fanbase.
United's afternoon was symptomatic of their entire season.
In the end this Premier League season will be seen as an unmemorable one with runaway winners never one that excites fans although City's dominance along with the arrival of Mo Salah to Liverpool will not be forgotten quickly.
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Some players think it is stylish football, ' he said.
"I saw lots of people on the moon because we won against City".
Ultimately, Rodriguez was the hero for West Brom - and City.
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. His players, in other words, have started choosing their games and, in the case of Paul Pogba in particular, it was not a surprise if Mourinho picked up the stench of complacency.
Darren Moore has taken two matches to equal Alan Pardew's total number of Premier League wins (one in 18 games) as West Brom manager.
Eight minutes later, United managed their first real foray into the box when Romelu Lukaku found himself in space 16-yards out, but his stinging shot was brilliantly saved by Ben Foster.
"I hope that we can have a happier Monday in seven days". You don't win titles with inconsistency. It is also amongst the reasons why United fell so much behind City and why they would have so many different performances in short spaces of time.