Cesc will meet his former club in the round of 16.
And he told Panenka: "Barça are a great team, they have the best player and he's the scariest.
"But we are a good unit, a good team, we are competitive. We know who we play and we will try to do what we have to do to play against Barça.
"Eliminating Barcelona is difficult, but not impossible. It will be special to return to Camp Nou."