Mourinho claimed afterwards that he had not been happy with the City result because he knew they would win the league regardless and he accused some of his players of getting carried away. Champions City - say it enough times and it starts to sound like a discount mall - are, it goes without saying, the team United need to surpass next season.
He said: "Probably because I (have) won eight championships I was not in the moon with the victory against them, because that doesn't make me feel super happy".
But Mourinho is in no doubt he is the right man to lead United's title challenge next season.
Even though West Brom parked several buses and were fortunate, their 1-0 victory in May 2015 was the first time United had lost three consecutive league games since 2001 as Louis van Gaal's side finished his first season poorly.
United dominated possession early on, but despite the efforts of Romelu Lukaku and Alexis Sanchez, precious little real impact was made by the home side.
"The mental level, the day by day, everything must be consistent until the last day so one of the things we have to improve is consistency".
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Mourinho attempted to end the stalemate - and the tedium - by introducing Anthony Martial with half an hour remaining and his introduction undoubtedly lifted the quiet Old Trafford atmosphere.
Man United players look on dejected after the final whistle.
"Maybe also City will invest massively and they don't let the others close the gap to them, I don't know", said Mourinho.
West Bromwich Albion have lost just one of their last five Premier League visits to Old Trafford (W3 D1 L1), with their only loss in this run coming in November 2015 (0-2). Everything was slow. Everyone was one more touch, one more trick, one more flick, one more turn. Everything was complicated. We couldn't think fast, we couldn't play fast.
It was a kind of collective neurosis which unfolded, and it was another example of these players lacking believe themselves and Mourinho lacking a clear attacking plan. After Paul Pogba drew a comfortable save out of Foster with a tame strike from distance on seven minutes, the visitors created two good chances. I have lots of experience because I won eight titles and I was not over the moon. but I saw lots of people who were on the moon.
"They won the title because they were the best team, because they won a great amount of points".