Cardiff City have been left shocked and dismayed after Nantes demanded the first instalment of the transfer fee for Emiliano Sala, who was on board a plane that went missing a little over a fortnight ago.
Nantes emailed Cardiff last Thursday in relation to the payment terms and the Welsh club's failure to transfer the first of three instalments.
Cardiff have withheld the first scheduled payment until they are satisfied with the documentation.
Sala and pilot David Ibbotson were on board the Piper Malibu aircraft that went missing over the English Channel on January 21, carrying the player from Nantes to Cardiff ahead of his planned first training session with the team.
A source at Cardiff City told the BBC that they were prepared to pay Nantes the fee once they had "all the facts" but were surprised the French club was making demands at the point of time.
Investigators have not confirmed if 28-year-old Sala is the body visible in a video footage taken underwater of the crash site.
The Air Accidents Investigation Branch (AAIB) are now trying to recover a body from the wreckage, although there is no confirmation whether the body identified is Sala's.
A private search funded by Sala's family discovered the Piper PA-46 Malibu plane carrying him from Nantes to Cardiff within hours of starting the operation on Sunday.
A Nantes supporter stops by a poster of Argentinian player Emiliano Sala outside La Beaujoire stadium after the footballer went missing in January.
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