Investigators searching for a lost plane carrying Premier League soccer player Emiliano Sala said on Wednesday an underwater search would begin after they found two seat cushions on the French coast that likely belonged to the aircraft.

The 28-year-old Argentina-born forward had been en route from Nantes in western France with pilot David Ibbotson to make his debut for Welsh team Cardiff City when the plane disappeared over the English Channel on Jan. 21.

Britain's Air Accidents Investigation Branch (AAIB) said it was informed on Monday that part of a seat cushion had been found on a beach near Surtainville on the Cotentin Peninsula in northern France.