Mikel Arteta admits Arsenalâ€™s performance was "not good enough" after a 3-1 Champions League home defeat to Bayern Munich.
"We are very disappointed with the result," the Spanish midfielder said.
"I think for them to be 3-1 up is not good enough from us. We made some mistakes that cost us a lot in the game. That was the difference.
"We have to go for it. We know it is very difficult at the moment but you never know in football.
"We may score early in the game and if we keep believing, as we did in the second half."