Paddy McNair has suffered a hamstring injury and will be out for three weeks[GETTY]
The youngster sustained the injury during United's 2-1 victory over Everton on Sunday afternoon.
McNair has subsequently missed-out on the opportunity to represent Northern Ireland for their forthcoming Euro 2016 qualifiers with the Faroe Islands and Greece.
The 19-year-old was expected to provide cover for his injured team-mate Jonny Evans who hobbled off during United's 5-3 defeat to Leicester.
Talking Points - Gameweek 7 Round up
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The unfortunate strain will merely delay his inevitable debut for the national team. McNair's impressive start to life at Old Trafford certainly suggests a call-up won't be too far away.
Louis Van Gaal selected the young Irishman due to a plethora of injuries to his star-studded squad with Jonny Evans, Luke Shaw, Chris Smalling and Phil Jones being ruled-out.
McNair has certainly capitalised on his opportunity, but his injury will jeopardise his chances of featuring in United's starting-eleven in the upcoming clash with Chelsea.