Star midfielder Pedri is back in Saudi Arabia with eyes on another Supercopa title as Barcelona are set to take on Athletic Club in the semi-final on Wednesday at King Abdullah Sport City.
Ante Budimir scored twice as Osasuna stunned Barcelona, who dropped points in La Liga for the first time this season after a seven-match winning run.
La Liga giants Barcelona will receive financial compensation for the recent injuries sustained by two of their star players.
Pedri is getting back to his best form and will play a key role in Spain's European Championship campaign, head coach Luis de la Fuente said after the Barcelona midfielder scored twice in a 5-1 win over Northern Ireland.
In a Barcelona setback, coach Xavi Hernandez expressed concern over the potential lengthy absence of midfielders Frenkie de Jong and Pedri.
Barcelona remain third in La Liga after being held to a 0-0 draw by Athletic Bilbao at San Mames.