Wenger believes in Arsenal's '5% chance'

Robin van Persie scored both Arsenal's goals
against Liverpool 

Arsene Wenger says Arsenal must believe they overturn AC Milan's 4-0 lead to qualify for the quarter-finals of the Champions League on Tuesday night.

Arsenal was stunned in the San Siro when a opener from former Tottenham midfielder Kevin-Prince Boateng was followed by a brace by former Manchester City striker Robinho before a late penalty by Zlatan Ibrahimovic effectively ended the tie as a contest.

Wenger described the match as a "shocking performance," but felt little genuine hope of progress.

"I said I don't live in a dream world - that means I know we have not created an easy situation, but when you are a top-level competitor, even if statistically we have a 5% chance, what is important is that we believe that we can be in this 5% chance," Wenger said.

"That is what is at stake for us - to show that we have the quality to believe we can do it, even if it is only 5%. Let us make sure that we do not miss out chance because we did not believe in it."