Cardiff City have been threatened with a three-window transfer ban by FIFA if they fail to pay the first instalment of the fee owed to Nantes for the late Emiliano Sala.
The FIFA Players' Status Committee ruled in September that Cardiff must hand over a €6 million (£5.3m) payment for club-record signing Sala , who, along with pilot David Ibbotson, died when their Piper Malibu aircraft crashed in January.
Sala had accepted a move but Cardiff claimed the agreement to pay Nantes £15m was not legally binding because conditions insisted upon by the selling club were not fulfilled.