The Brazilian joined Barcelona in a £23.5million move from Sevilla last summer after snubbing a move to Stamford Bridge.
He said: “I was close to signing with Chelsea but luckily it did not happen and I moved to a team that suits me perfectly.
“I am convinced that we are going to give people something to speak about in the Champions League.
“Barca are always amongst the favourites thanks to their football and their greatness.
“We are a step closer from our target, which is to make the final in Rome. What we must do is achieve a great result at home and then qualify up there.
“Barcelona are going to be a very tough adversary for Chelsea.”
