Arsenal boss Unai Emery was happy with Mesut Ozil after defeat at Chelsea on Saturday.

Emery, however, insists Ozil can still work more after his substitution.

He explained: "We need him. He helps us with his quality and also I want to push him to be competitive in every match. I am happy with Mesut because he worked hard. I decided to change it because I think we needed a little more of a push in the middle, so that we couldn't let Chelsea progress easily with the ball.

"We were defending too deep and we needed a push, so for that I brought on Aaron to push up more and recover the ball to continue attacking. I am happy with Mesut. With him I am going to do the same work, help him and demand also that he works every day. At the moment he is doing that and I am happy. In the process, he is one player that I am sure is going to have a good season."