And Mourinho says United have serious issues that prevented him from achieving his objectives, saying there was more to blame than his bad relationship with the star midfielder.
"I think he will leave because you need to feel the love when you play somewhere, you need to be committed", the former Manchester United player told Sky Sports. I do not want to talk about it and I have the feeling that I do not need to speak, that time gives explanations.
He's since made no secret that he faced opposition from players within the dressing, citing record-signing Paul Pogba as one of the prime instigators in the supposed winter unity against him. "Two is that the problems are still there".
The World Cup victor was signed by Mourinho from Juventus in the summer of 2016, with the Portuguese confident the midfielder would help the club win the Premier League title. "I'm certain that Manchester United one day will return to be the club as it was in the old days with Mr. Alex Ferguson".
"Martial is a boy with a different personality".
He added: "I said nine or 10 months ago that after winning eight championships, finishing second with United may have been my greatest achievement". After losing 2-0 at home in the first leg, United sealed a spot in the quarter-finals with a 3-1 win in France.
"I've a lot of respect for all clubs - those that think of me and those that don't think of me", Mourinho said.
But the larger problem at United, such as boardroom members (ahem, Ed Woodward) muddling into soccer decisions when they should stick to business, is what is really holding them back.