A body has been recovered from amidst the wreckage of the plane which crashed with footballer Emiliano Sala and pilot David Ibbotson on board, The Air Accidents Investigation Branch (AAIB) said.
The Argentine striker was Premier League club Cardiff's record signing.
Nantes have consulted lawyers to explore legal options to ensure Cardiff City pay the transfer fee for Emiliano Sala, a source close to the French club revealed Wednesday.
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Sala and his pilot David Ibbotson have been missing since shortly after their plane took off from France on January 21.
According to a report by BBC Wales, Nantes have demanded receipt of the first instalment of the fee and have threatened legal action if it is not received in 10 days' time.
Cardiff is looking into details about who owned the plane and who insured it as investigators work through weather difficulties to recover the body that's been seen inside the wreckage, and they intend to meet their transfer obligations to Nantes, according to the Mirror report.
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Cardiff are "surprised" that Nantes have made the demand while recovery attempts are still being carried out.
The aircraft remains 67 metres underwater 21 miles off the coast of Guernsey in the English Channel as poor weather conditions stopped efforts to recover it.
Bordeaux, Sala's previous team, are thought to be due 50% of the transfer fee as per the terms of the deal which had taken him to Nantes.
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The 28-year-old was on his way back to Cardiff from Nantes after saying his goodbyes to his old team-mates in France.