The Premier League outfit head into the second leg of the semi-final clash at the Nou Camp with a 1-0 lead and the Spaniard believes that Roberto Di Matteo's side can hold off the Catalans for 90 minutes.
"It is clear that Barcelona are a step ahead of all other clubs," Torres told UEFA's official website. "They have reached the last five semi-finals. But this is football - the best team doesn't always win.
"Xavi and [Andres] Iniesta are players who dictate the rhythm of the game. When you play against them, you need to know that they are guiding the game. Many teams who play Barcelona think that you have to steal the ball from them, but I don't think that's possible.
"You have to use different weapons against them. If you want to steal the ball, you won't manage it and you'll get tired, and then create more space for your opponent."
The 28-year-old has also claimed that it will be a "catastrophe" if the former English champions fail to reach fourth spot in the league.