The German has been tracked for some time by Wenger, who finally made his move for the Werder Bremen man after the defeat.
“I don’t think that (the defeat by United) was the reason, I want to believe they (Arsenal officials) were monitoring me for quite some time. For me a childhood dream comes true,” he added.
“There is such incredible potential and we will get out of the position the team is currently in. Arsenal have this ability … to play good football, and to have Wenger on top of that as coach is unbelievable.”