Luisao knows his former team-mates Ramires and David Luiz have been briefing their new Blue team-mates.
But he says it will make no difference tonight and said: "Chelsea have improved in the last few weeks, but they are not the strong team they once were.
"I see they have just failed to win at home against Tottenham.
"I am convinced David Luiz and Ramires have explained secrets of our team to their companions.
"But that will not be sufficient to damage our chances of getting to the semi-finals.
"Our dream is to reach the final and we won't let Chelsea stop us. I don't believe they will play an attacking game in Lisbon - perhaps they will play on the counter-attack. But we are prepared to stop the likes of Didier Drogba and Fernando Torres.
"Our defenders have been motivated to have their best night of the season. The key for us is not to concede at home and to take a lead to London."