Lamboley added that the club wanted to give the French star a new contract but haven't been able to agree with the player after months of negotiations.
GETTYMan Utd boss Jose Mourinho is prepared to fight to keep hold of Anthony Martial
Martial's agent told RMC Sport "After looking at all the possibilities and different factors, Anthony wants to leave Manchester United".
"There are many parameters, for now it's premature to talk about it. Anthony will speak later to discuss all of this".
Asked if any clubs had made contact regarding Martial, Lamboley replied: "I can not say anything on the subject at the moment but you think that from the moment a player like Anthony is on the market a lot of clubs are interested". That's why this decision has come - it's a well-thought-out decision.
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There are suggestions that United are reluctant to sell Martial to a domestic rival, but the prospect of landing Alderweireld and not having to part with any cash could tempt Old Trafford chiefs to alter that stance.
"It's important to remember that he is under contract and that Manchester United will have the last word".
"However, we do not have the same vision on Anthony's future".
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Lamboley said Martial, who joined United for £36m in September 2015, was "disappointed because he has shown his love for the club and the supporters for three seasons". "Anthony just wants to play, to feel happy and connect with his coach, that is essential".
"It is important to remember that this season he scored 11 goals and provided ten assists in five months". He was chosen Player of the Month three times by fans. Then arrived the transfer window of January.
Sky Sports have also reiterated reports that Tottenham are poised for a transfer after this week's comments. Everyone will have his opinion, I think he must resume the course of his career.
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With Romelu Lukaku the first-choice centre-forward and Sanchez favoured by Mourinho on the left-hand side of his attack, Martial and Marcus Rashford have spent much more time on the bench last term than they'd have liked.