Noussair Mazraoui could be available for Manchester United’s Premier League showdown with Liverpool after recovering from a ‘mystery injury’.

The Morocco international was spotted back in training with his countrymen during the international break despite not featuring in either game against Bahrain and Congo.

The former Bayern Munich star initially picked an injury during United’s opening pre-season match against Leeds United.

Maintaining fitness has been an issue ever since with the right-back missing the opening games of the Premier League season against Arsenal and Fulham, coming off the bench against Burnley before starting games on the right against Manchester City and Chelsea.

He missed United’s last two games and was ruled out until after the October international break.

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The ‘mystery’ problem is now thought to have eased, The Sun report, with the defender hoping to be in contention for the trip to Merseyside on Sunday.

Mazraoui joined United from Bayern for a modest...