Arsene Wenger claims he has identified weaknesses in Barcelona which his Arsenal side can exploit in Tuesday's Champions League encounter.
The Gunners head to the Camp Nou for the second leg of a European quarter-final in positive mood following a 2-2 draw with the reigning European champions last week.
Arsenal bounced back from two goals down to level the tie and Wenger is upbeat about the return leg despite suffering a host of injury problems.
Captain Cesc Febregas will miss the remainder of the domestic season after suffering small crack in his right fibula during the first leg.
Robin van Persie, Andrey Arshavin, William Gallas, Aaron Ramsey and Kieran Gibbs will definitely miss the trip to Spain, while midfielder Alex Song is a major doubt with a groin problem picked up during Saturday's 1-0 Premier League win over Wolves.
"We created chances, even in the first half when we were dominated," explained Wenger.
"We have not only to defend against them, but use the ball better than we did in the first half.
"There are some ideas we have to exploit.
"It is going to be a hard game but we think we can do it. This is a trophy we want to win and to win the Champions League you have to beat the best teams."