Andre Onana received a second yellow card during Manchester United's penalty shootout win over Coventry on Sunday - but he was not dismissed.
The Cameroonian goalkeeper was initially cautioned in the 85th minute for delaying the restart from a goal-kick, when Coventry were trying to find an equaliser at 3-2.
He was also booked in the penalty shootout for arguing with the referee Robert Jones - but he was able to stay on the pitch.
IFAB rule 10.3 states that bookings picked up during the regulation match are not carried through to penalty shootouts - but players who pick up a red card cannot return to be involved.
It was the same rule that meant Emiliano Martinez was not dismissed during Aston Villa's Europa Conference League victory over Lille - although he will miss the semi-final first leg after acquiring three yellow cards across the tournament.
More to follow...