Luis Enrique’s side have already won La Liga, finishing two points ahead of rivals Real Madrid, and they face Juventus in the Champions League final on June 6.
Barcelona have won the most Copa del Rey’s in history (26), followed by Saturday’s opponents Bilbao (23). Although??Ernesto Valverde’s side have won the competition many times, they have not done so recently, last triumphing in 1984.
The match takes place at the Nou Camp, a stadium in which Bilbao are winless since 2001. Athletic finished the La Liga season in seventh place, missing out on Europa League football, despite not losing any of their final seven games.
Barcelona, impressively, won 12 of their last 14 La Liga matches to secure the title, drawing the other two. They overcame former boss Pep Guardiola and Bayern Munich in the Champions League semi-finals and are on course to win the treble this season.
Despite missing the last two weeks through injury, Barcelona forward Luis Suarez is expected to return to the side for the Copa del Rey final. Thomas Vermaelen is fit after coming through his Barca debut unscathed last time out.
Athletic Bilbao are without Ander Iturraspe, Jonas Ramalho, Oscar de Marcos and Iker Muniain, who are all out injured. Aritz Aduriz has scored 10 goals in his previous 11 games, and will lead the line for Bilbao.