Arsene Wenger wants his players to give everything in their game against AS Monaco in the second leg of the round of 16 tie at the Stade Louis II.
The Gunners trail the tie by virtue of a shocking performance at the Emirates where they were defeated 3-1 by the French giants and need a performance better than what they have produced all season to come out victorious.
The Gunners have come into form since that debacle, winning against Manchester United at Old Trafford in the quarter finals of the FA Cup and following that up with an impressive performance against West Ham at the Emirates.
Olivier Giroud, who had a shocker of a game against Monaco, scored the opener against West Ham, while Aaron Ramsey and Mathieu Flamini sealed the game for the Gunners in the second half.
Wenger rested Santi Cazorla, Hector Bellerin and Danny Welbeck for the game, with the trio expected to slot straight back into the squad in the midweek.
"If you have no belief, you have no chance. We have to believe that we can do it and give everything. This time Monaco are favourites so we have to go there, give absolutely everything and come out of the game with that feeling," Wenger told Arsenal's official site, when asked about their chances against Monaco.
Wenger also heaped praise on Giroud in the post match conference, heralding him for his ability to bounce back from adversity.
"It's one of his strengths. This is a boy who has played at 22 or 23 in division three. He's come out and has become an international footballer. You need some mental strength to do that because there's no red carpet there. You have to work hard to get out there and get to the top - you need some special strength," Wenger added.