#3 He has fallen out with the board
Mourinho has always been a controversial manager, and wherever he has been, he has always made a couple of snide comments aimed at those above him. It has been a different story at United though, and he has constantly made his displeasure with the lack of support from the board clear to the press. One of the issues for Mourinho is that there are no ‘football men’ above him at the club. There is no Director of Football. Ed Woodward is a businessman, he may be a good businessman, but he doesn’t understand the game the way Mourinho does.
This was perhaps the biggest problem during the summer. Mourinho was desperate to bring a centre back to the club, with Harry Maguire and Toby Alderwerield among his top targets. Woodward failed to sign any of those targets, and United have been shambolic at the back all season. We saw him have a fractious relationship with his board in the final days at Chelsea, and we are seeing a repeat of that here.