The Greek giants face Real in Madrid this week in their Champions League clash and Raul Bravo said: "I don't have anything to prove.
"I'll always be grateful to Real because that's where I have learned my football, won many trophies and I'm the player I am thanks to them.
"The Bernabeu is one of the best stadiums in the world and I want to play well. I am not going to think about whether the fans are going to whistle or applaud me. I was not a star and I do not think that fans will give me a standing ovation!
"I believe that my return is going to quiet."