Tottenham are also interested, and Martial has intimated that he would be prepared to move to White Hart Lane, though United would rather he was sold overseas.
He was left out of France's World Cup squad after making only four Premier League appearances after February.
"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".
Philippe Lamboley, director of USFA management, has told French media that United do not want to lose the France global but have not found an agreement with him over a new contract.
"After reflecting carefully on all the possibilities and all the parameters, Anthony has decided he wants to leave Manchester United", said Lamboley as quoted on RMC Sport. Right now Anthony is disappointed because he has shown for three seasons the love he feels for the club and its fans.
"I think when United, the most powerful club in the world, is not in agreement in eight months of negotiations, it's that they don't really want to make him an important player in the team".
Mourinho has lost faith in Martial despite a good first half of the season, with his game time significantly limited after the January arrival of Alexis Sanchez. I can tell you that without the unconditional support of the fans, Anthony would have already asked to leave United.
"I think he has done his best for three years". He was chosen Player of the Month three times by fans. All I can say is that many coaches appreciate his talents and many clubs are proposing their projects to Anthony.