While United are keen to keep Martial, there is a sense that a bid of around £60million would be enough to prise him away from Old Trafford.
Like Martial, Marcus Rashford is understood to be frustrated by a lack of game time and is considering quitting.
While this was eventually solved by switching him around, wherein the one-time striker now memorably conquers the left attacking flank, this winter shut even that.
His relations with Mourinho have gone "cold" since the turn of the year, with the Portuguese coach favouring new recruit Sanchez in the starting XI.
Now, things may have finally led to peak frustration for the Frenchman.
He can still be an invaluable asset to the Red Devils if Mourinho can get the best out of him-the manager would perhaps be better served doing his best to achieve that rather than bringing in someone new.
The Italian giants are among a number of clubs, including Paris St-Germain, Inter Milan, Atletico Madrid and Tottenham, who are monitoring Martial's situation at United.
All signs seem to indicate a probable departure in the coming window, with the player's agent, Philippe Lamboley, stating: "Will he stay in Manchester in the summer? I'm sorry, but at the moment I can not say anything else about it".
Anthony Martial of Manchester United celebrates scoring the opening goal with teammate Romelu Lukaku during the Premier League match between Burnley and Manchester United at Turf Moor on January 20, 2018 in Burnley, England.
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