The Ligue 1 club will face the Blues in the return bout of the last-16 tie of Europe's elite competition at Stamford Bridge on Wednesday and the Brazilian feels leading by a solitary goal with the Blues having netted one on the road makes it a tricky affair.
He said: "It was an important win. We played a good match at home, but the job isn't finished yet, on the contrary.
"Two goals to one is a complicated result. We'll have to go to London with the intention of scoring but I'm persuaded that if we can play as we did in the first leg, we can qualify for the quarters."