The Red Devils start their Premier League season with a home match against Leicester City on 10 August, and are away at Percy Tau's new club Brighton & Hove Albion the following week.
However, the Portuguese has been informed that he will have to let one of his existing central defenders go, in order to make a move for Maguire.
Mourinho then listed out a couple of examples, probably in anger, as he stated that he wanted to play all the pre-season matches in Los Angeles.
Mourinho is unlikely to allow United to sell the French forward to another English club and will not let the 22-year-old leave Old Trafford unless it is for the right price and to the right club.
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Mourinho suggested Pogba had been more consistent at the World Cup because he felt "extra commitment" to France and hinted he should adopt the same approach when he gets back in a United shirt. "Of course, when we welcome them [Maguire and Jamie Vardy] back I hope we can to give them the opportunity to continue their ambition and perform in the Premier League".
How do you think Mourinho's United will do this season? So against Leicester and Brighton the situation is not wonderful for us.
"I don't think it is a case of us getting the best from him but a cae of him giving the best that he has", Mourinho said. "But for the first two matches we have to fight for the points, so that is what we are going to do with the players available".
"If you look to the players that Chelsea and Liverpool have in the pre-season, especially these two teams, also Arsenal, you see the difference of the situation", he said.