Sam Borden provides the latest on the investigation into what caused the plane Emiliano Sala was aboard to crash and the complex process of recovering the aircraft.

FC Nantes have demanded payment from Cardiff City for the first instalment of the £15 million transfer of Emiliano Sala, a source has confirmed to ESPN.

The BBC were the first to report the news.

Sala and pilot David Ibbotson were on board the Piper Malibu aircraft that went missing over the English Channel on Jan. 21, carrying the player from Nantes to Cardiff ahead of his planned first training session with the team.

Borden: In search for Emiliano Sala

Cardiff plan to honour their financial commitment to the deal but had been withholding the transfer fee until the investigation into the incident had concluded. The club have yet to pay anything to FC Nantes.

Nantes demand that the first instalment be paid within 10 days under the threat of legal action.