Arsenal manager Arsene Wenger is facing the prospect of losing Jack Wilshere to suspension after his apparent indiscretion in the 6-3 defeat at Manchester City.
The midfielder appeared to make a hand gesture towards the crowd during the second-half at the Ethiad stadium; the FA will await the referee's report before deciding whether to act.
"If he did it and he is banned then we will have to accept it," Wenger said. "I don't know if he did it."
Liverpool striker Luis Suarez was handed a one-match suspension and fined after he had been charged over a similar incident following a Liverpool defeat at Fulham in 2011.