The club has been struggling to register its new signings due to the La Liga 1:1 rule. Barcelona signed Joan Garcia from Espanyol, but the player's registration is still pending.
Ter Stegen has been stripped of the captaincy, reportedly due to a disagreement over a consent form related to his wages. The form would have allowed the club to use his salary to help register other players.
Centre-back Ronald Araujo is now wearing the captain's armband. Barcelona has also launched an investigation into the matter.
Ter Stegen, 33, was expected to leave the club this summer to help with financial issues. However, he underwent knee surgery and is now unable to make a transfer.
In a statement, Ter Stegen explained that he had surgery with the club's agreement. He hopes to resolve the situation and continue playing for Barcelona.