"I have a lot of respect for the team," he said of Dortmund on Monday. "They play very fast, very offence very similar to Arsenal.
"It will be a good match tomorrow. We will play offensively, they will play offensively so it will be a very attractive match.
"Dortmund have very good technical qualities, they are well organised.
"Although they have not started the season well, they will be confident for the match tomorrow and they will give everything in the first 20 minutes.
"With the fans behind them, it will be a very attractive match.
"Football in Germany is in a good way. They play good football in Germany, especially here in Dortmund."