Etan Mbappe was sent off in Lille's 3-2 defeat to Betis in the first round of the Champions League. Mbappe could miss more than just the second round.
Kylian Mbappe's brother deliberately elbowed Nathan in the face, with VAR giving him a red card. The 19-year-old's violent conduct may not end with just a suspension for the Arsenal game.
UEFA regulations provide for additional measures for violent conduct, with the minimum suspension continuing for three matches.
The decision will be made by the end of this month. Etan Mbappe has the right to appeal.
