Martial's agent Philippe Lamboley confirmed to French outlet RMC that his client had chose to leave United after a hard couple of seasons working with manager Jose Mourinho, as he has become a regular bench warmer and struggled to make his mark when chances came his way.
"Manchester United wants to extend Anthony's contract and does not want him to leave but we have not found an agreement for several months".
Independent.ie have been told that Tottenham are eager to sign Martial and with United now struggling to find agreement with Spurs in their efforts to sign Belgian centre-back Toby Alderwiereld, the comments from Lamboley could pave the way for a deal that suits both clubs.
"After thinking about all the possibilities and parameters, Anthony wants to leave Manchester United", Martial's agent told RMC Sport.
The 22-year-old did not get the minutes he expected under the former Chelsea boss in 2017/18 season, which contributed to him missing out on France's squad for the World Cup in Russian Federation.
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He added that United have the final word on whether he will be allowed to leave.
I think that when Man United, who are the most powerful club, can not come to an agreement after eight months it is because they really don't want to make him a key player.
Martial joined United as a teenager who, at the time, was touted as a potential future Ballon d'Or victor.
"We do not have the same vision of Anthony's future".
Lamboley also suggests that Martial could have asked to leave long time ago but was reluctant because of the great support he gets from Manchester United fans.
"Anthony is disappointed because he has shown for three seasons he had for the club and its supporters". He was chosen Player of the Month three times by fans. Everyone will have his opinion, I think he must take back control of his career. "Anthony just wants to play, find pleasure, feeling with the coach will be essential".