"I have the feeling we can do this," he told reporters on Monday. "I believe we have enough talent to qualify for the quarter-finals. We face one of the greatest teams, they have won European Cups and Italian leagues, but we have one of the best squads Barcelona has ever had and I really think we can do this.
"We have to try to attack from the start. The fans always back the team if they see we're fighting. I want the fans to believe in us, to support us. We need 90,000 people to believe in us and believe we can qualify for the quarter-finals.
"We have to contend with a 2-0 deficit and play against a magnificent team. We will create as many chances as we can. We also know we can't afford to concede a goal. It's a question of believing in ourselves. If we do that, then it's easier for things to go the way we want them to."
Barcelona warmed up for Tuesday's game with a 2-0 home win against Deportivo La Coruna in La Liga on Saturday.