Nani in training ground fight?

Nani's future at Manchester United is reportedly in doubt after he was involved in a fight with a teammate in training.

The Portuguese winger took exception to a challenge by youngster Davide Petrucci at the club's Carrington complex on Thursday.

He later punched the Italian when the players were in the gym, according to the Daily Mail.

The pair were then quickly separated by other members of the squad.