Manchester United could be without the services of Marcos Rojo for a number of weeks with a shoulder complaint.
It is believed that the Argentine defender sustained the injury during a training session yesterday morning.
According to The Mirror, the United coaching staff are concerned that the 25-year-old has suffered a dislocation, just as he did during the Manchester derby in November 2014.
The report adds that Rojo may have to undergo an operation to fully correct the problem, which will further extend his time on the sidelines.
Rojo joined the Red Devils from Sporting Lisbon for £16m in the summer of 2014.