Arsenal boss Arsene Wenger is confident his side can turn their weekend frustrations into a match-winning performance against Barcelona.
The Gunners were held to a 0-0 draw by Sunderland on Saturday despite having a goal ruled out for offside when Andrey Arshavin appeared level with the last man.
Things do not get any easier for the North Londoners when they travel to Catalonia on Tuesday for their last 16 UEFA Champions League encounter, although they take a 2-1 lead to Camp Nou.
Wenger admits that he was extremely frustrated following the stalemate with the Black Cats, but is now confident of a turnaround of fortunes in Spain.
He said: "We have a big game on Tuesday and we have to recover well. We have the confidence, we beat them here and can beat them there."
"We are very frustrated because we gave a lot and unfortunately we could not score," the Frenchman added.
"We had tried absolutely everything and also Sunderland defended very well.
"In these games you need to be patient, and not make mistakes. That is what we did.
"We did not make mistakes at the back - but if you cancel goals for offside when it is not offside, it is difficult to win football games."
Young midfielder Jack Wilshere is set to feature against Barca despite an injury scare and the England starlet also expressed his disappointment following the Sunderland result.
"It is difficult to take, but it is part and parcel of football. Maybe next week we will get a decision go for us," he said.
"Obviously we are upset because we did not take three points, but we just have to get on with it.
"There is a long way to go in this title race and we are up for it."