Belgian cyclist Michael Goolaerts has died in hospital after suffering a heart attack during the Paris-Roubaix race.
An investigation has been launched into the death of a Belgian rider during Sunday's Paris-Roubaix classic.
"It is with unthinkable sadness which we've to communicate the death of our rider and friend Michael Goolaerts".
But France 3 posted a video showing the rider receiving emergency CPR at the side of a road and is reporting that he suffered a cardiac arrest.
The team planned "no further communication as we want to give his close ones time to deal with this awful loss".
"Thank you to all my teammates".
Goolaerts rode for the Veranda's Willems-Crelan team, who announced that they would ride De Brabantse Pijl on Wednesday. The rider was found unconscious by race doctors.
It is his second win in the "monuments" - cycling's five most prestigious one-day races - following his Tour of Flanders victory in 2016.
Team-mate Luke Rowe later withdrew after being caught up in a crash involving Tony Martin and Alexander Kristoff with 48km to go.
Team Sky said in a statement: "Everyone at Team Sky is heartbroken by the loss of Michael Goolaerts".
Fabian Cancellara, a three-time victor of Paris-Roubaix, wrote on social media: "Terrible news...."
However, despite desperate medical assistance, Goolaerts passed away surrounded by friends and family.
Two-time Tour de France victor Alberto Contador said: "My deepest sympathy to the family and friends of Michael Goolaerts, since the end of the race I have not stopped thinking about him".
Goolaerts previously represented the Lotto-Soudal team.
Tweeting in Flemish, the captain of Veranda's Willems-Crelan Cycling, Wout van Aert, noted that as they were the same age they had spent a lot of time riding together.
Sunday's tragedy completely overshadowed the race itself, won by Slovakia's three-time world champion Peter Sagan.