Jose Mourinho's men had deliciously put the brakes on Manchester City's crowning as the 2017/18 Premier League champions last Saturday at the Etihad Stadium but, against the nearly doomed Albion, they handed the title to the Blues, with Jay Rodriguez scoring the victor.
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.
A week after City surrendered a 2-0 lead to lose 2-3 to United and squander the chance to wrap up the title in flawless style against their arch-rivals, it was relegation-bound West Brom who served it up on a plate.
Jay Rodriguez scored the only goal that has now delayed West Brom's confirmation for relegation and has confirmed City as champions.
United was too narrow and predictable, with wide players Alexis Sanchez and Juan Mata constantly cutting inside and leaving the midfield congested.
City will now celebrate their Premier League success at home to Swansea next Sunday. "Everybody is equal at the football club and we're all in it together".
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He said: "We've got faith in one another, the players, the staff. Things have gone a bit by the wayside this year".
"Manchester City, we won it for you" chanted the West Brom fans at the end of a match greeted by jeers by the home faithful.
West Brom took the lead against the run of play on 73 minutes as Rodriguez headed in past De Gea from a corner which came off Matic. Now they were wandering around like zombies, drenched in a Mancunian downpour, losing against the worst team in the league.
"I have won titles, I would not be happy if someone say won title if someone lose a match".
"I have no reason not to trust - eight titles are eight titles and three Premier Leagues are three Premier Leagues".
United's best chance of the game was a Romelu Lukaku header, which was superbly saved by Albion goalkeeper Ben Foster. It was a slow game and we didn't play well at all. I think with my experience you don't win titles with inconsistency.