The North London outfit have a hefty task of overcoming a 3-1 deficit from the first leg at the Allianz Arena tomorrow in order to reach the quarter-finals of the elite competition.
"It is not mission impossible," Wenger told the club's official website. "It can be done, but first of all you need 100% commitment, attitude and things to go your way. But usually football goes your way when you have the right attitude.
"There is a kind of [feeling of] 'let's really play with freedom'. Let's start strong. We have to create doubt in their mind and you only do that if you have a real go."