Athletic Bilbao coach Marcelino says they're preparing for the Supercopa de Espana final against Barcelona presuming Lionel Messi will play.

Messi is struggling to make Sunday's clash due to injury.

Marcelino said, "We have to play our way but [also] bearing in mind how our opponent plays.

"We won't change the main aspects of our play and we won't divert from our idea whether Leo is playing or not.

"His presence on the field limits our chances of winning, though. We'll presume he's going to play, that he's going to be at his best and that we'll have to stop him."