Al-Nassr have failed to pay Leicester City the money they owe them over Musa’s transfer.
Musa signed for the Saudi Arabian Pro League side in a €16.50m deal in 2018, shortly after impressing at the World Cup in Russia.
While the Knights of Naja have paid the transfer fee, they are yet to pay the add-ons, despite The Court of Arbitration for Sport (CAS) ruling.
According to Ben Jacobs, Al-Nassr were ordered to pay the Foxes €460,000 in performance-related add-ons.
However, the Saudi Arabian giants are yet to obey CAS’ ruling, forcing FIFA to ban them from registering new players ahead of the new season.