Speaking to reporters, Arteta said: "When you don’t get picked, there are certain ways to react. Leo is upset, but he is upset and shows on the pitch how good he is – not upset and comes in and reacts badly. That is a huge quality. Then, when you put him in the starting line-up, he does exactly the same thing.
"That is a big message and a big example for the rest of the team and myself. We have two great left wingers and Reiss Nelson can also play in that position so it is always a challenge but you know you are going to get that quality."