Marcus Rashford is an early doubt for Manchester United's trip to Liverpool on Sunday.
The in-form striker was brought off the bench by Ole Gunnar Solskjaer against Wolves tonight, but he lasted barely 15 minutes.
Rashford appeared to injure his lower back in a rather innocuous collision with a Wolves defender.
The Englishman attempted to continue after being treated on the field, but he fell to the turf once again and was eventually replaced by Jesse Lingard.
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Rashford looked in a lot of discomfort as he departed the pitch and he now faces a race against the clock to make the Liverpool game.
Manchester Evening News journalist Samuel Luckhurst appeared to confirm that Rashford was carrying a knock prior to the FA Cup reply tonight.
He tweeted: "Rashford's been using a bone healing device recently and had it with him again when the squad gathered pre-match. Clearly carrying an injury of some kind, regardless of the circumstances of that knock."
Rashford has expressed his desire to be involved in every single game for United, but his eagerness to play may have harmed the club ahead of their biggest game of the season.
The onus will be on Anthony Martial to fill the massive void left by the 22-year-old if he is ruled out.
Solskjaer will at least take some solace in another win for the Red Devils after their 4-0 thrashing of Norwich on the weekend.
Juan Mata scored the only goal of a rather dull game at Old Trafford to send United into the fourth round of the FA Cup.
But would the manager swap a win for his talisman back fully fit for the weekend? He probably would.News Now - Sport News