Barcelona coach Pep Guardiola has urged fans to not make it a hostile atmosphere tonight against Real Madrid.

Guardiola knows emotions are running high after events during the first-leg of their Copa tie last week.

"I just hope the ground is full. What would upset me most is for the place not to be packed to the rafters," he said.

"You will see two great teams put on a very good show. The rest doesn't matter. Come to enjoy yourselves, to support us, to be with us and to forget about the rest. Watch Real Madrid. Not a specific manager or player ... If the atmosphere gets too heated it's because we haven't learned from the past, but I'm convinced that we are a mature club. The whole world is watching us and we have to show that we do our talking with our football."