By Joe Brewin

Arsène Wenger believes Arsenal’s Champions League group is one of the toughest he has ever encountered.

The Gunners face an imposing trip to Borussia Dortmund on Tuesday night, while Olympiacos and Marseille compete in the other Group F tie.

Wenger has seen Arsenal qualify for the last 14 Champions League tournaments, getting beyond the group stages in the last 11. The boss believes that, in his experience, this is one of the strongest he has seen yet.

“Especially because Pot Four gave us Dortmund,” the boss said. “That’s why it is very difficult - Marseille, Dortmund and Olympiacos.

“Sometimes you discover the real difficulty when you are in it and when we play the games.

“It’s a good opportunity for us to get positive vibes, and we need a bit of that.

“Every team, no matter how good they are, needs confidence, and I believe my team needs that at the moment.

 “It would create a certainty that we have a good chance to go through. For us to get a positive result tomorrow night would be a big lift.“

Copyright 2014 The Arsenal Football Club plc. Permission to use quotations from this article is granted subject to appropriate credit being given to www.arsenal.com as the source 12 Sep 2011