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Cardiff City's new football star Emiliano Sala was in a light aircraft that disappeared en route to the Welsh capital where he was to join up with the team, France's civil aviation authority has confirmed.
Argentine Sala was flying from the French city of Nantes to Cardiff when the plane lost radar contact off the English Channel island Guernsey late on Monday (local time).
Rescue aircraft and boats scoured more than 2500 square kilometres of sea for the single-engine Piper Malibu on Tuesday.
Guernsey police said a number of floating objects had been seen in the water but they were unable to confirm whether any were from the missing aircraft.
As night fell, search operations were suspended. Police said they will resume at sunrise on Wednesday.
Forward Sala (28) joined Premier League strugglers Cardiff from FC Nantes last week for a club record fee of about €17 million ($NZ28 million). He had played in France since 2012.
"We expected Emiliano to arrive last night into Cardiff and today was due to be his first day with the team," club chief executive Ken Choo said in a statement.
"We continue to pray for positive news." Tuesday's training session was called off.
"The management and the whole club are staying hopeful and the whole FC Nantes family is praying for Emiliano Sala and the other passengers to be found safe and sound," Nantes said in a statement.
British authorities contacted airfields along the coast to check if the plane had made an unplanned landing, but there was no sign it had, Guernsey police said.
The plane had been cruising at 5000 feet when the pilot requested to descend to a lower altitude on passing Guernsey. It lost radar contact at 2300 feet, the police said.
John Fitzgerald, chief executive of Channel Islands Air Search, said: "If they are wearing the right dry suits or they got into a life raft, then the probability is not too bad.
"If they are in the water without any protection, the water is really too cold at the moment for any form of survival beyond an hour or so," Fitzgerald told Sky TV.
Sala's father Horacio told Argentine TV channel C5N: "I didn’t know anything because I’m away from home, I’m a truck driver. A friend who saw it on TV told me. I'm in despair."
Julio Muller, the mayor of Progreso, the small town in the farming province of Santa Fe where Sala grew up, told Clarin online: "The town is in shock. The only thing we were talking about was his transfer."
Daniel Rivero, the president of Sala's first club, San Martin de Progreso, told radio LT9 he was "hoping for some kind of a miracle."
Sala scored 12 goals for Nantes this season.
France's soccer federation postponed Nantes's French Cup last-32 game against Entente Sannois-Saint Gratien that was scheduled for Wednesday.
Sala on Monday tweeted a photo of himself bidding farewell to his Nantes team mates, saying. "The last one. Ciao @FCNantes."