City have won the title with five games to spare, equalling the English top-flight record which was first set by United in 1907-08.
In his post-match press conference, Mourinho made reference to the eight titles he has won in his managerial career and why this was a reason behind why he did not "feel super happy" when his side defeated City last weekend.
Guardiola might not have seen Jay Rodriguez's 73rd-minute winning goal at Old Trafford because he was playing golf with his son instead of watching the match.
A week after preventing their neighbors from clinching the title in front of their own fans by rallying from 2-0 down to win 3-2, United delivered a similarly unlikely result as managerless West Brom pulled off one of the shocks of the season.
He said: "I don't know if I was the first or if I was the second or the third, but I congratulated them face-to-face when I had the chance to do it".
And the 2003-04 Arsenal side remain the only team to go through a Premier League season unbeaten, so there are some achievements that this City team has been unable to chalk off.
The 47-year-old also took the German title three times with Bayern Munich, but he believes the unique strength in depth and physical demands of the Premier League makes this triumph among his very best.
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However, the Blues roared back with a thumping 3-1 victory over Tottenham on Saturday making sure there's no further holdup to their crown.
Speaking after the game, the United boss said: "We were masters in complicated football".
"I think we share one thing maybe, the hunger and desire to never be satisfied", said Kompany.
Guardiola is the first Spaniard to win the English title. The loss enable them to be crowned champions as Sports Bonus from 12bet predicted early this season.
Although Mourinho says that he is not expecting Pobga to perform like that every week, he does want the midfielder to be more consistent for his team moving forward.
A 16-point lead with five games to play and 93 goals scored represents an emphatic response, not that any doubts ever existed inside the City dressing room.
However, Mourinho has tried to temper expectations over Manchester United's summer business and has played down claims of an enormous spending spree.