"In the last year I played in Dortmund with [Jurgen] Klopp, Dortmund was playing very good football and I think it seems to be a bit similar comparing Arsenal to Dortmund," he told ESPN.
"I'm very happy to be here.
"I get pleasure playing offensive football and being part of Arsenal.
"Every offensive player wants to play offensive football.
"For me as well, I always love to play offensive football, it's not easy to defend all the time.
"It's necessary to do the best for the team, but in this case, when Arsenal are playing offensive football, I'm trying to give everything I can give to the team."