Arsenal winger Theo Walcott believes they're capable of over running Barcelona in next week's Champions League quarterfinal second-leg tie at the Nou Camp.

According to Walcott, their fitness levels could be decisive when the teams reconvene in Spain next Tuesday.

"Barcelona did play well for 60 minutes, but then died off for the last 30," Walcott told arsenal.com.

"Playing at that sort of tempo is very hard to do for the whole game. We are a very fit team and we came right at them. It will be a very tough game but if we frustrate them and get an early goal their fans will be right at them. It will be a great game for the neutral.

"We need to play our football, get the ball down, keep it and frustrate them at times - like they did to us, especially in the first half. They created a lot of chances and if it hadn't been for our goalkeeper they could have scored a few more."