Marc-Andre ter Stegen is a doubt for Barcelona's next La Liga meeting with Espanyol, while Arthur will not return in time for the Supercopa de Espana.
Goalkeeper Ter Stegen is undergoing treatment on a tendon problem in his right knee and was declared "unavailable" by Barca on Monday, five days before they return to action against their local rivals.
The Germany international may have picked up the injury in Barca's most recent game, a 4-1 win over Alaves at Camp Nou which sent them two points clear at the top of the table.