The 26-year-old has impressed since joining from Wolves in the summer and looked set to retain his starting role in the Red Devils' return to Premier League action against Everton on Monday.
But a surprise source has sparked concern over Cunha's availability after the Brazil international pulled out of Altrincham's 'Neon Noel' Christmas lights switch-on event on Saturday.
In a social media post, Visit Altrincham said: "Unfortunately Matheus Cunha has had an accident in training today and will not be able to attend tonight's Christmas Lights Switch on in Altrincham due to medical reasons."
Cunha had been due to switch on the lights in Altrincham with Sam Aston, who plays Chesney in Coronation Street.
The Independent have contacted Manchester United for comment.
There are now question m

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