"Liverpool won the European Cup two years ago so we know it could go either way," said the Brazilian.
"I think we'll have to be at our very best to make it through to the last eight.
"Liverpool's incredible win in 2005 was amazing and an achievement we must be aware of.
"We have to learn from what happened to Milan. It would be a mistake not to consider Liverpool as one of the favourites to win this season's Champions League.
"Not only have they already won it, they have a team capable of doing it again.
"But we are a force in this competition and have an obligation to show them our quality too."