French media have reported that record signing Emiliano Sala was on board the plane travelling from Nantes to Cardiff that went missing.
French media, quoting police sources, said Sala was on the light aircraft that disappeared from radar on Monday night while apparently flying from Nantes to Cardiff.
Cardiff chief executive Ken Choo has given an interview to the club's media department that is expected to be released later this afternoon.
The Premier League club cancelled their scheduled training session on Tuesday morning, which Sala had been due to take part in.
The 28-year-old Argentinian striker completed a move to the Premier League club over the weekend but had returned to France, where he had been playing for Ligue 1 side Nantes.
France's civil aviation authority said Sala was aboard the plane, according to reports.
Cardiff chairman Mehmet Dalman told the Mirror: "We are very concerned by the latest news that a light aircraft lost contact over the Channel last night.
"We are awaiting confirmation before we can say anything further. We are very concerned for the safety of Emiliano Sala."
Sala had signed a three-and-a-half year deal with the Welsh club after scoring 12 Ligue 1 goals in 19 appearances this season.
Guernsey Police posted on Twitter on Tuesday morning that the search had resumed at 8am but that there was still no trace of the plane.
It read: "Searching for the light aircraft PA 46 Malibu resumed at 8am this morning. No trace has currently been found.
"It was en route from Nantes, France to Cardiff, Wales with 2 people. More info when available."
Another update before midday revealed that over 1,000 square miles had been searched by five planes but no trace of the missing plane had been found and the search was continuing.
1/2 There are currently two planes, two helicopters and a lifeboat searching for the aircraft. No trace has yet been found. Conditions during the search last night were challenging, with wave heights of up to two metres, with heavy rain showers and poor visibility — Guernsey Police (@GuernseyPolice) January 22, 2019 2/2 Today the sea is much calmer, although visibility was good, it is now deteriorating. UK authorities have been calling airfields on the south coast to see if it landed there. So far we have no confirmation it did. Search continues. Decision at sunset about overnight search — Guernsey Police (@GuernseyPolice) January 22, 2019
Guernsey Police then confirmed that "two planes, two helicopters and a lifeboat" were searching for the missing aircraft but that "no trace had been found."
That statement also said that conditions for the search had been difficult overnight but had improved.
"Today the sea is much calmer, although visibility was good, it is now deteriorating," the statement read.
"UK authorities have been calling airfields on the south coast to see if it landed there. So far we have no confirmation it did.
"Search continues. Decision at sunset about overnight search."
Nantes were due to travel to Entente Sannois for their Coupe de France clash on Wednesday evening, but the third-tier outfit have agreed to postpone the match until Sunday, January 27.
A statement from Sannois' official website read: "The round-of-32 Coupe de France match between Entente Sannois and Nantes initially scheduled for Wednesday, January 23 has been rearranged for Sunday, January 27 following the disappearance of the plane of the former (Nantes) player Emiliano Sala.
📅 Le match est reporté au dimanche 27 janvier Plus d'infos : https://t.co/QCtGHHHfLT#ESSGFCN — Entente S.S.G (@Entente_SSG) January 22, 2019
"Sannois wish all the best to Nantes and to the family of Emiliano Sala at this challenging time.
"The club is also thinking of all the people on board the plane."
Sala, a native of Santa Fe in Argentina, played at youth level for Club Proyecto Crecer in his home country before being snapped up by French club Bordeaux in 2010.
He was then sent out on a series of loans to Orleans, Niort and Caen and after failing to make more than a handful of appearances for Bordeaux, Sala joined Nantes in 2015.
It was in Brittany that his career began to flourish.
Sala's hat-trick against Toulouse in October 2018 was the first by any Nantes player in Ligue 1 since 2006.
Cardiff signed the forward in a deal reportedly worth in the region of £15million, breaking the previous record of £11million paid for Gary Medel in 2013.
