The crash, which came just 37 kilometres into the 183 sprint stage from Lorient to Pontivy, came about after a touch of wheels at the front of the peloton. Thomas hit the deck first, and could be seen clutching his collarbone/shoulder area afterwards.
Gesink, meanwhile, had nowhere to go and somersaulted over Thomas. The Dutchman, a key domestique for race favourite Primož Roglič, abandoned the race soon afterwards, though his injuries have not yet been confirmed.
Tony Martin was also held up by the crash and waited for Gesink to be tended to before setting off again.
Walloon broadcaster RTBF reported that Thomas had suffered a dislocated shoulder in the crash, though that news has not yet been officially confirmed by his team.
Luke Rowe, Jonathan Castroviejo and Dylan Van Baarle dropped back and help Thomas return to the peloton, with the Welshman lying over two minutes down after the crash. Thomas made it back to the main group at 125 kilometres to go.
Daniel joined Cyclingnews as staff writer in August 2019 after working as a freelance journalist for seven years, including time spent working for Cyclingnews and sister magazine, Procycling.
Thank you for signing up to Cycling News. You will receive a verification email shortly.
There was a problem. Please refresh the page and try again.