Nasri admits Arsenal do not have the players to prevent Barca from dominating the second-leg.
"We must rely on our game if we want to win. We can't play another game to stop them. We are not Inter Milan," he said.
"We have players who love football, who want to play attractive football.
"We will go to the Nou Camp and play our game. They will attack us with pace and we must take them on the counter.
"We are confident we can beat them in the Nou Camp. It will be a similar game to the first leg - Barcelona play the same away as they do at home.
"It will be difficult to beat them, but even if we draw we qualify, so we can go through."