Manchester United manager Ole Gunnar Solskjaer felt Fred's tackle that saw him sent off was "nowhere near a foul" but said the midfielder may have been lucky earlier.
Fred was sent off in the second half of United's 3-1 Champions League loss at home to Paris Saint-Germain on Wednesday.
The Brazilian was booked in the first half for an apparent headbutt on Leandro Paredes, before getting his second yellow card after appearing to win the ball ahead of Ander Herrera.
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Fred conceded four fouls but his eight possessions gained were the equal most at Old Trafford despite seeing red with 20 minutes remaining.