Manchester United full-back Noussair Mazraoui will be absent for several weeks after undergoing a minor heart procedure.
Mazraoui joined United from Bayern Munich in a deal worth an initial £12.8million (€15m) in August and has quickly established himself as the Red Devils first-choice right-back.
He has started all seven of their Premier League games this season, with Erik ten Hag s men taking just eight points to record their worst-ever start to a campaign in the competition.
On Monday, he withdrew from Morocco s squad for two Africa Cup of Nations qualifiers against the Central African Republic, having experienced heart palpitations.
Widespread reports on Thursday then said Mazraoui had successfully undergone a corrective procedure and would return within a few weeks.
Mazraoui was withdrawn at half-time in United s goalless draw with Aston Villa on Sunday, with Harry Maguire also replaced at the interval.
Leny Yoro, Luke Shaw and Tyrell Malacia are long-term absentees, meanwhile, leaving Ten Hag s men short in defence ahead of their return to action against Brentford on October 19.
Three Reds withdraw from October internationals
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