Athletic Bilbao coach Ernesto Valverde says they go to Barcelona wary tonight.

Bilbao will be defending a 4-0 lead from the first-leg of the Super Cup.

"It was an historic result. It's very difficult to score four against Barca and not to concede any. What we did in the first-leg can end up counting for a lot, or for absolutely nothing," said Valverde.

"When you beat a top team, it's almost as if it was more about them and their poor performance than you and what you did.

"Nobody in our dressing room thinks that the job is done. Nothing has been won. They are going out to score five. I hope that my team don't concede any and this will secure us the title."