Athletic are into the final after victory over LaLiga champions Atletico Madrid in the semifinal.
“We were the better team and we deserved to win," Marcelino said. “I think we played a pretty complete game, right from the start.
“In general terms, the match was very even, Atlético took the lead from a set piece and we were able to come back thanks to our attacking strategy.
“Now we'll play in another final. Since I arrived, I've been lucky enough to have competed in four finals thanks to Athletic and the players I coach."
Marcelino says they're underdogs facing Real Madrid in the final.
“To say that's not the case would be dishonest. We're playing against three global teams.
“For us it's an honour to be here to defend this title and to be here where so many other would like to be. But it's Athletic who are here with these three giants. We're going to try and bring home another Supercopa. We can't wait for Sunday."
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