Belgium's Michael Goolaerts was taken to hospital after crashing earlier in the race.
According to the post-race Decision of the Commissaire's Jury sheet, both riders have been fined for breaking UCI race regulation article 12.1.040/23, which states that no unauthorised refreshment should be taken in the final 20km of a race.
He suffered cardiac arrest and was airlifted to hospital in Lille but died on Sunday night.
A statement from the team read: "It is with unimaginable sadness that we have to communicate the passing of our rider and friend Michael Goolaearts".
The statement added: "For now there will be no further communication as we want to give his close ones time to deal with this awful loss".
Narendra Modi's fast to protest against the Parliament session disturbances
Randeep Surjewala of Congress also said the BJP-led central government should be blamed for the Parliament washout. The PM also dedicated a loco factory in Madhepura and laid the foundation of a track-doubling project in Bihar .
McGregor bailed after being charged with assault by NYPD
Footage from the fracas shows McGregor approaching the bus as it inches towards the truck elevators to exit the building. Chiesa was taken to the hospital, White said, and later was ruled out of his scheduled fight against Anthony Pettis .
Prince Charles reunites with Aussie school mate in Brisbane crowd
Reports recently emerged that Charles carries around his own personal toilet seat, which he has called it a "load of crap". So, he doesn't carry his own toilet seat when he travels?" Prince Charles: "Oh, don't believe all that crap".
"I avoided crashes, and, actually, I feel less exhausted than the previous years", said Sagan, the first rider since Frenchman Bernard Hinault to win here as a world champion.
Goolaerts rode in support of cyclo-cross world champion Wout van Aert of Belgium in the race dubbed the "Hell of the North" because of the hard terrain it covers. "No further news at the moment", the team tweeted. He was soon attended by a medical team and seemed to receive CPR. "We share their vast sadness", Mr Lappartient wrote on Twitter.
He said: "All the thoughts and prayers of the @BORAhansgrohe team and myself are with Michael Goolaerts".
He also rode as a stagiaire for Lotto-Soudal in the latter months of the 2016 season, before rejoining Verandas Willems-Crelan in 2017.
Just two years ago, another young Belgian rider, 22-year-old Daan Myngheer, died in hospital two days after suffering a heart attack on the Criterium International in Corsica.