The Portuguese coach has already made clear that he wants to develop a United side to compete both now and in the future, but his early work has so far only culminated in the Red Devils producing their worst-ever start to a Premier League season, despite signs of tactical progress being made on the pitch.
"When I went to Real Madrid, they had gone 25 years without a Spanish Cup and lots of years without a championship. Inter Milan were 50 years without a Champions League," said Mourinho, according to The Mirror.
"Those jobs were hard but at United, from a tactical point of view, I have never had so many contradictions before in my career.
"I am having to take the team in a totally different direction from the previous manager – and that is not a criticism of him. But I am ready for it. It is good fun, and I am very happy to do it."
United currently sit in sixth place in the league standings after collecting 20 points from 13 games.