However, despite that, Mourinho still forked out to lure Alexis Sanchez away from Arsenal, with Henrikh Mkhitaryan moving in the opposite direction.
And that has supposedly led Martial to weigh up his options.
The forward failed to score following Sanchez’s arrival and, when Romelu Lukaku was not fit enough to start the FA Cup final against Chelsea in May, it was Rashford who was given the nod.
The MEN say a second reason Martial wants out is because of United’s failure to agree a new contract with him.
This was recently confirmed by his agent, Philippe Lamboley, saying: "After thinking about all the possibilities and scenarios, Anthony wants to leave Manchester United.
Man Utd transfer news: Anthony Martial has never clicked with Alexis Sanchez (Image: GETTY)
Manchester United: Mourinho drops hint that Martial will stay
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“There are many scenarios. For now, it's premature to talk about it. Anthony will speak later to explain all of this.
"Manchester United want to extend Anthony's contract and do not want him to leave, but we have not been able to find an agreement for several months.
"I think that when Manchester United, which is the most powerful club in the world it must be remembered, do not find an agreement in eight months of negotiations, it is because they do not really want to make him an important member of the team. That's the root of this decision. It is a well-considered decision.”
"However, it is quite obvious and it is very important to remember that he is under contract, that Manchester United will have the last word and that we will respect the decision of the club, and he will fulfil his commitment to them.”