Reports in the French media claim Cardiff City have launched a lawsuit against FC Nantes over the tragic death of striker Emiliano Sala.
The Bluebirds agreed a fee of £15m - a club record - to sign the forward in January 2019.
His transfer was announced by the club after the loss to Newcastle United, although two days later he was tragically killed when flying from Nantes to Cardiff.
And French media outlet L'Equipe have reported that the suit insinuates the Ligue 1 outfit may be guilty of manslaughter and the hiding of agent commissions.
In a statement, the Bluebirds have confirmed that they believe there is "sufficient evidence of wrongdoing" that warrants an investigation "of those responsible for the arrangement of the transfer on behalf of FC Nantes and for arranging the doomed flight".
A club spokesperson said: “CCFC has been clear throughout the past 12 months that a full investigation of the facts leading up to the tragedy is required. Not only to fully understand what led to the downing of the Piper PA-46 Malibu plane, but to answer the wider questions that have been highlighted in this case, specifically related to the use of illegal flights in the football industry and the role of intermediaries in player transfers.
“As a result of our investigation we believe there is sufficient evidence of wrongdoing that necessitates investigation by the French authorities of those responsible for the arrangement of the transfer on behalf of FC Nantes and for arranging the doomed flight.
"We have therefore passed over information to the Parquet de Nantes to assist their efforts. We remain committed to establishing the full facts and adhering to any final decision on our financial liability in the transfer.”