Wayne Rooney may not be fit enough to play in the Manchester derby on Sunday after he was reportedly seen limping at a promotional event at Old Trafford on Monday.
Rooney's absence would be a major blow for Louis van Gaal who is looking to continue his four-match unbeaten run, following wins against West Ham and Everton and draws with West Brom and Chelsea.
Fellow striker Radamel Falcao also missed the Chelsea game because of injury, though Van Gaal has said the Colombian could return against their rivals.
Rooney attended the promotional event after apparently injuring himself during training earlier in the day; Van Gaal has previously complained about how the club's commercial demands could negatively impact on his squad.
United left-back Luke Shaw thinks Rooney will be itching to put on another match-winning display when he returns from suspension this weekend.
"It's a massive boost for us to have him back," Shaw said.
"It's something I think he's looking forward to. Wayne hates sitting on the sidelines watching.
"That goal (in 2011) was an unbelievable goal in a match that big. It was something special."
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