Per The Mail, McTominay has a knee injury that was a result of an hyper-extension against Chelsea.
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He missed the game against Liverpool at the weekend as a result of that problem.
McTominay, who signed a new sponsorship deal with adidas this month, may even miss the FA Cup semi final in more than a week's time.
He is certainly out for United's game against Bournemouth in the Premier League on Saturday.