Anthony Martial wants to leave Manchester United, his agent has confirmed.

Martial has grown increasingly disillusioned under Jose Mourinho at Old Trafford and will seek a transfer this summer in what could prove a potential collision course.

The 22-year-old’s frustrations at failing to win a regular starting place at United were compounded by his omission from France’s 23-man squad for the World Cup finals and he is unhappy at the lack of assurances he has been given over his role by the club.

Philippe Lamboley, Martial’s representative, issued a stinging rebuke of United by claiming they had not demonstrated they were serious about keeping the player after eight months of protracted negotiations came to nothing.

“After thinking about all the possibilities, Anthony wants to leave Manchester United,' Lamboley told RMC in France.