Gibson, who made his senior debut for the Republic of Ireland in Slovakia last week, suffered the injury during a 5-2 defeat in a match that was specially arranged to pit United´s youngsters against their Portuguese counterparts.
Although there has been no official confirmation of a precise recovery time for the 19-year-old, who was expected to make his first senior appearance for Sir Alex Ferguson´s side in next Wednesday´s Carling Cup clash with Coventry, early estimates are that Gibson will be out for ´a few weeks´.
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