Mikel Arteta questioned the dismissal of David Luiz after nine-man Arsenal's 2-1 defeat at Wolves.
Defender Luiz and goalkeeper Bernd Leno were shown red cards as Joao Moutinho's stunning effort earned Wolves their first win in nine games.
Nicolas Pepe had given the Gunners the lead as they threatened to run riot in the first half.
But Luiz was dismissed by referee Craig Pawson after conceding a penalty for a trip on Willian Jose which allowed Ruben Neves to level and Leno saw red when he handled outside his area in the second half.