Speaking to Sky Sports after the match, Arteta said of the difference between the Doku and Trossard incidents: "It is very obvious, I don't need to talk about it. I think the red card is very clear, very obvious what people think. It is not my job to come here and judge what happened. My job is to survive in one of the most difficult environments there is in football for 55 minutes and try to get things done to survive.
"The rest is not my job, but it has already happened twice in five games which is very worrying to see in the best league the Premier League. [The red card] makes the situation impossible. It is very, very hard to play with 11 players, with 10 it is impossible. With ten you have to defend your six-yard box time and time again."