Mikel Arteta has urged his players to keep their cool as he prepares to welcome back Granit Xhaka from suspension for Sunday's north London derby.
Xhaka is available again after receiving a straight red card in Arsenal's 5-0 defeat at Manchester City before the international break, a costly incident that Arteta spoke to the midfielder about following the game.
It was the latest occasion a moment of ill-discipline has hampered Arteta's side after games against Leeds, Burnley, Southampton, Wolves and Villarreal last season in which they had a man sent off and failed to win.