The Gunners face Borussia Dortmund in their opening game of the Champions League campaign on Tuesday.
“Dortmund were the best team in Germany last year, they do a good job passing the ball and have great players,” said the German central defender.
“It will be difficult for us but I know we have very good players and I’m confident we can get a result.
“Dortmund are the toughest opponent in our group, so we will be very happy if we can take something from this match.”
