United are already set to be without a number of players for the match against City at Wembley in just over a month’s time.
Donny van de Beek is out until next season, with the Netherlands international sidelined ever since a 3-0 win over Bournemouth in January.
Lisandro Martinez has been ruled out until the end of the campaign, too, having been forced out of a recent 2-2 draw with Sevilla.
And United are anxiously waiting to see if Raphael Varane will be available for selection by the time with City rolls around.
Reacting to his injury blow last month, meanwhile, Garnacho admitted he was crushed after missing out on his first Argentina cap.
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