Manchester United defender Marcus Rojo has revealed how his injury hell has tested his mental strength to the limit.

The Argentine ace has returned home for further treatment on an unspecified problem he first suffered in the World Cup that forced him to miss the first 20 games of United's season.

United have no idea when he will be back and Rojo, who has endured fitness problems for the past two campaigns, said: “The worst thing about it is that it is the second year running I have not been able to have a full pre-season with my team-mates.

“These kind of things can happen in football.

“That's the game of football. It can happen to anyone and this time it happened to be me.

“It's all about being strong mentally. I am strong mentally and it is now about turning it around and starting again. I'm always going to fight hard to earn my place in the side."