Second-place United dragged the title race out for at least another week by winning 3-2 at City last weekend, only to gift the trophy to City by losing to a team that is destined for relegation and had just one league win since August.
And ahead of Sunday's game against West Brom, Mourinho challenged Pogba to erase the occasional substandard performance from his repertoire.
He is the first Spanish manager to win the Premier League title - a prize he says is the hardest to claim in Europe.
Here's how the footballing world reacted to City's title win.
"With my experience you don't titles with inconsistency". "Probably because I won eight championships, I was not in the moon with the victory against them [City]".
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Fairfield's first hit of the day came with one out in the bottom of the fourth, as senior Evan Connolly reached on a double. They added another run in the fifth when Rodriguez hit his second home run of the game when leading off the inning.
After by a distance their worst week of the season as City blew the chance to seal the title on home soil against United and were dumped out of the Champions League quarter-finals 5-1 on aggregate by Liverpool, they showed why they are champions by bouncing back against Spurs at Wembley. "Then the first time you lose one, you think you're never going to win another ever again", he told Sky Sports.
"Manchester City, we won it for you", chanted the West Brom fans at the end of a match greeted by jeers by United supporters. We always gave them the opportunity to be solid, compact in the low block with strong physical players.
Pogba scored twice in three minutes at the Etihad Stadium as United turned a two-goal deficit into a 3-2 victory, and in doing so forced their rivals to wait a little longer to secure the Premier League title.
19 - City have beaten every opponent in the Premier League this season, becoming the third team in history to do so, after Chelsea (2005-06) and Manchester United (2010-11). Manchester City (28 wins) are now just three wins away from this with five games to play. It was three years ago and I know how to win. "They have lost only two matches because they are the best team and are champions". Everything was slow. Everyone was one more touch, one more trick, one more flick, one more turn. "Masters of complication - we complicated our football since the beginning and gave West Bromwich Albion the chance to feel quite comfortable in their football". By the hour mark, Mourinho had brought on attacking players Jesse Lingard and Anthony Martial for central midfielders Ander Herrera and Paul Pogba but things didn't really improve.