The 20-year-old also ruptured his liver as part of the knock and has spent the past three days in a Finnish hospital following his nation’s Euro 2016 qualifier against Finland.
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McNair picked up the injury during the early stages of Northern Ireland’s 1-1 draw with Finland on Sunday night but he somehow managed to carry on until half-time before finally being substituted.
Team doctor David White has remained in Helsinki to monitor McNair’s condition and is staying in close contact with United’s medical staff.
Manchester United’s Paddy McNair is set to undergo tests in hospital today following an injury suffered on global duty. It is believed he might be allowed to return home on Wednesday to rest and recuperate.
There is not expected to be an update from Old Trafford until manager Louis van Gaal addresses the media on Friday ahead of his side’s Premier League game at Everton.
McNair, 20, played 18 times for United last season but has appeared just once for them in this campaign.
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Sport’s Simon Stone believes McNair will be out of first-team action for two weeks.
