Neymar is regarded as Santos' best hope of upsetting Barca.
"If we have the ball, Neymar won't be in it. We're focusing on ourselves and on Santos globally as an opponent. We won't change the way we think," said Cesc.
And Cesc refused to be drawn on the future of the young Brazilian star, who has been linked to a number of clubs in Europe: "Tomorrow Neymar is just another opponent. He'll want to score three or four goals. In the future we'll see what happens to him."