Arsenal must overcome history to see off Champions League opponents Porto tonight.

Not since Willie Young scored Arsenal's winner against Hajduk Split at Highbury to win a UEFA Cup second-round tie on away goals more than 30 years ago have they overturned a first-leg deficit in Europe.

They have never done it in the Champions League, but must start now if they are to progress to the last eight.

"We have a good chance to make history," smiled Arsene Wenger, who's team trail Porto 2-1 after a first leg most memorable for the mistakes of stand-in goalkeeper Lukasz Fabianski.

"To score away from home is still a massive advantage in the UEFA rules and that is why we are confident. To lose 1-0 away is a terrible result because you know, if you concede one, it's nearly over.

"We have scored and that to me is a massive difference. This time, if you score one, you are through if you don't concede. It is a tricky game but we know we can score goals. We want a better defensive performance."