Sala was signed by Cardiff City for a club-record fee on January 19, but according to the BBC, the Premier League club 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.
According to Sky Sports News, Cardiff have not yet paid any of the £15m fee agreed for the Argentine striker.
Small plane breaks apart over California neighborhood, killing 5
The station said video on social media captured images of "panicked residents rushing about the street". Video posted on Twitter showed panicked residents running to a home that was engulfed in flames.
Reports of Nantes' demands come amid the discovery of a body aboard the wreckage of the plane.
Sala was on board the plane with pilot Dave Ibbotson.
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 source at Cardiff told British media that the Welsh club will honour the contract but only once they have clarified "all the facts".
India monitoring detention of students after USA sting operation
The fake university was opened by Homeland Security investigations to trap those involved in illegal student visa racket. It is unclear how many students are facing deportation, but it's being called one of the largest sweeps in recent years.
Cardiff have yet to make a payment and Nantes put extra pressure on the Premier League side by asking for the first payment last Thursday.
Emiliano Sala's former club Nantes were over joyous when they scored in the ninth minute against Toulouse in another emotional tribute to the player.
Air accident investigators have confirmed that an attempt to recover the body found in the wreckage has begun.
Senate Vote Opposes Ending US Wars In Syria And Afghanistan
McMaster, former National Security Council adviser, repeatedly warned Trump not to make a swift withdrawal from the Middle East. Thursday also marks the most stark divide yet between the top Republican in the Senate and the president.