Ruben Amorim was seen sporting a plaster across the back of his left hand during his side's semi-final second leg triumph over Athletic Club to reach the Europa League final on Thursday night.
United booked their spot in the Europa League final by virtue of a 7-1 aggregate thrashing of Athletic Club, thanks to goals from Mason Mount, Casemiro and Rasmus Hojlund at Old Trafford.
The Red Devils already had one foot in the final, ironically to be played in Bilbao, after beating their opponents 3-0 in the first leg, and will now take on Tottenham in an all-English affair later this month.