Arsenal boss Arsene Wenger believes they can upset a cocky Bayern Munich in their Champions League clash.

Bayern host the second-leg defending a 3-1 lead.

"We have to try to put Bayern on the back foot, subconsciously anyway, they think they are through and we have to subconsciously think that we can do it.

"The only way to do it is to have a very positive attitude from the start," said Wenger.