Manchester United winger Adnan Januzaj could face a spell on the sidelines with what appeared to be a knee injury.
The 21-year-old suffered the complaint while in action for United's Under-21 side against Norwich City at Old Trafford this evening.
Having picked up the problem Januzaj initially attempted to carry on, but the attacker was eventually substituted and he limped off down the tunnel.
Soon after the Belgium international had departed the action, right-back Guillermo Varela was also replaced with a muscular injury.
The Uruguayan has made four appearances for the senior side this term.