The winger has been impressive in recent games.
Emery said: "For different players, the adaptation of the Premier League and our idea, style, demands - it is easier or sometimes more difficult. It depends. Moussa Diaby, he is getting better and he is with the possibility to play in different positions.
Advertisement
Advertisement
"He can play more wide, as a number 10 inside, as a second striker and I am very happy with his progression. Often, I am speaking about him about the possibility to play in different positions and to get his best performances, his adaptation higher too.
"He needs to be calm in different moments when he wasn't. Now, it is the same - of course, I am very happy with him. I am being very demanding with him and he is completely involved in our structure."