French club Nantes have demanded payment from Cardiff City over the £15m transfer of Emiliano Sala, BBC Wales has learned.
Sala, along with pilot David Ibbotson, was on board the Piper Malibu N264DB which lost radar contact near Guernsey on 21 January.
The Argentine striker was Premier League club Cardiff’s record signing.
Cardiff have withheld the first scheduled payment until they are satisfied with the documentation.
More to follow.