AGUERO’S RUSSIAN MISSION Sergio out to prove he is one of world’s best /Pages 58&59

UNITED remain determined not to sell Anthony Martial, despite the Frenchman’s agent claiming he wants to quit Old Trafford.

The forward’s future has been thrown into doubt after falling behind Alexis Sanchez in Jose Mourinho’s pecking order.

United’s plans to sign another forward this summer - with Gareth Bale and Marko Arnautovic targets - will further damage his chances of first team football.

But the belief within Old Trafford is that Martial remains capable of fulfilling his potential as one of Europe’s most exciting attacking talents.

Despite interest from Tottenham and Juventus, United have tried to tie the 22-year-old down to a new contract.

But comments from his agent Philippe Lamboley suggest he will be prepared to try to force a move after seeing his World Cup hopes killed by his failure to hold down a regular place at Old Trafford.

“After thinking about all the possibilities, Anthony wants to leave Manchester United,” Lamboley said.

“When Manchester United, which is the most powerful club in the world, does not find an agreement in eight months of negotiations, it is that it does not really want to make him an important player.

“It is a well-considered decision. He is under contract, United will have the last word and we will respect the decision of the club, it will go to the end of its commitment.

“We do not have the same vision on Anthony’s future. Without the unconditional support of the fans, Anthony would have already asked to leave United. I will not comment on the consequences of the January transfer window. Everyone will have his opinion, I think he must resume the course of his career. The time has come.”