The dueling managers both have 20 career titles to their name now after City claimed the title on Sunday after United were beaten by West Brom.
The Red Devils are on the verge of a trophy-less season after failing to seriously challenge Manchester City in the Premier League, with the FA Cup their last hope of silverware in 2017/18.
They need nine points from their final five games to break Chelsea's points record, while 11 more goals will break the goals record, held by a different Chelsea side.
"I didn't insult the referee", Guardiola said.
One of the Premier League managers who has had to take on Guardiola this season, Huddersfield Town's German David Wagner, admires the way the City manager has convinced his players to change.
City have lost just two league games all season and are on course to register the highest points total and the largest winning margin since the English top-flight was revamped in 1992. You watched the game, now get the inside look at Manchester City's preparations for Tottenham, the victory that inevitably carried them to the title.
"We've always said that the most important thing is to win it, it didn't matter how".
"To achieve what he has achieved in the game is special and to be part of a group of players led by him can only help us to keep developing".
Ultimately, Mourinho has had enough of waiting for many of his squad to come up with the goods and he wants more reliable players to come in and replace them this summer.
"We have five or six teams who are all able to win the league and that makes it incredibly hard".
De Bruyne has already spoken of the close bond in the City squad and has now revealed that the whole season has been enjoyable. If Pep Guardiola wins the title next season he will say he is starting to dominate English football and produce a great side, saying his team are the victor and he is the victor so next season is critical.
With the league title wrapped up and City's Champions League campaign ended by Liverpool, the club can cope without their all-time leading scorer, who has 199 goals for the Manchester Club after scoring 30 in all competitions this season.