The Germany attacker is in career best form, scoring five goals in nine games so far this season.
Advertisement
Advertisement
Arteta enthused: "The fact that he has gone through difficult times has made him a better player...
"He certainly has all the qualities and he certainly has the ambition to score 20 goals a season. In the end, scoring goals is sometimes a very small detail and many things have to go well, but his mentality has changed a lot in terms of that.
"He certainly has the ability to do it in my opinion."