The Brazilian full-back is eagerly anticipating a meeting with the Camp Nou side at the upcoming Club World Cup, and insists that while they are good, they are not unbeatable
The Copa Libertadores holders will enter the tournament in the semi-finals on December 14 and could meet the Uefa Champions League winners four days later if both sides win their respective matches.
"Barcelona are the best team in the world and are the clear favourites," Leo was quoted as saying by Sport.
"They have so much quality and their passing is especially impressive. Their players are great. However, we should not forget that they are men, just like us, and not gods.
"On the pitch it will be 11 against 11 and that's where the game will be decided. We have to believe in ourselves and see how far we can go."
The draw for the Club World Cup will be held on November 17.