Barcelona are not the only Liga club enduring difficulties registering players ahead of the new campaign.
A total of 90 players have been signed by Spanish top-flight clubs during the transfer window but so far only 34 have been registered.
Real Betis are still waiting to register new arrivals Willian Jose, Luis Henrique, and Luiz Felipe and may have to follow in Barca's footsteps by activating a 'lever'.
Almeria are also having problems and have not registered Pozo, Babic, Gui Guedes, Houboulang Mendes, Arnau Sola, Marko or Kaiky Fernandes.
Elche, Sevilla Rayo, Villarreal and Real Valladolid are also having issues ahead of the new campaign.