The crash investigators found two seat cushions they believed were from a plane carrying a Cardiff City footballer Emiliana Salu when he disappeared across the English Channel.
Two seat cushions sprouted on the same area of the coast, near the city of Surtainville in Normandy, about 30 miles from the last aircraft location.
The Argentinean assault family is currently in Europe after collecting funds to launch its own private search for the aircraft wreckage.
They hope the newest discovery will be the first step towards discovering what happened to a 28-year-old player and a pilot who took him from Nantes in France.
On Monday, the mother of footballers Mercedes and sister Romina crossed the area where Salin was last seen.
Light aircraft worn by Argentine footballer Emiliana Salu disappeared from radar last week
Investigators believe Monday to find two seats on a French-style plane
Two spots were found on the beach near the Cotentin peninsula in Normandy
The Air Accident Investigation Unit (AAIB) said today: "On Monday, January 28, the French security investigation agency informed us that part of the seat cushion was found on the beach near Surtainville on the Cotentin Peninsula.
The second pillow was found in the same area later that day. From the preliminary review we concluded that it is likely that the pads from the missing aircraft are likely.
A "priority search area" of about four square nautical miles has been established, and a specialized vessel is authorized to perform an overview of the sea bottom.
The AAIB statement states: "We are currently expecting our submarine search to begin at the end of this weekend and last for up to three days. Side scan sonar equipment will be used to try to locate the wreck on the seabed.
– If a wreck is found, a remote-controlled vehicle will be used to visualize the wreckage.
A lawful carrier carrying a 28-year-old Salu and David Ibbotson pilot disappeared on January 21 after losing contact with the Jersey airway control on Nantes to Cardiff.
Salina's mother and sister traveled on Monday by plane flying from Guernsey Airport and circling around the island of Alderney, one week after the plane dropped from the radar.
The family has hired a naval scientist David Mearns to help with private search, and the official investigation shares information with his team.
The AAIB statement said today: "We are aware that private research is being conducted in this area, and we work closely with those involved in order to increase the ability to find a wreck and ensure a safe search."
Pilot David Ibbotson was on board the aircraft when he left the radar last week
Salina's mother, Mercedes (center), and her sister Romina (right) visited Guernsey and spotted the last known plane location.
Two seats swim somewhere on the long beaches on Cotentin Peninsula
Mr. Mearns, who is in charge of a private search, said today that the ship he was organizing would work closely with the AAIB ship in the coming days.
He said: "The privately-funded search for the Emiliano aircraft will be conducted on behalf of the Sala family, in close collaboration with the AAIB's efforts.
"The two vessels will work together to search a certain area as safely, completely and efficiently as possible."
It is believed that the plane crashed into an English channel because the ice was blocked in the propeller or hit the wings.
He was on his way to Cardiff, where Sala joined his new teammates from Cardiff after signing from the French side of Nantes.
However, after an hour, the pilot requested air traffic control for a license to reduce the height from 5,000 to 2 300 feet.
Fans of Cardiff have shown salutations before the match of their team with Arsenal
It is believed that he might have been trying to get a heavier air after the propeller or wings covered by ice. But shortly afterward, the Coast Guard in Guernsey was warned that the aircraft had disappeared from the radar screens.
Aircraft experts asked why a lightweight, one-propeller airplane flying at night under freezing conditions across the English canal, where falling ice water in the dark made it more difficult to survive.
They also wondered why Mr. Ibbotson, a freelance pilot and gas engineer who did not have the license to wear the paying passengers, was last recorded in the aircraft for the last time.
It is alleged that he broke off three leaps and joking with Facebook friends that he was "a bit rusty" a few days ago.
Players and fans held a minute of silence ahead of Cardiff's Arsenal match last night.
Salino's name was also with the matchmaking teammates, and the banners they read read: "We've never seen you and you've never seen how to hit, but Emiliano, our beautiful Bluebird, will love you forever" .