Four-times Tour de France winner Chris Froome was airlifted to hospital in Toulon after suffering a training crash which left him with broken ribs and a back fracture, his team Israel-Premier Tech said on Thursday.
His team added that the 40-year-old suffered the crash on Wednesday but no other cyclists or vehicles were involved.
"Fortunately, Chris is stable and did not sustain any head injuries," a statement on social media said.
"However, scans have confirmed a pneumothorax, five broken ribs, and a lumbar vertebrae fracture, for which he will undergo surgery this afternoon."
Froome has won seven Grand Tours which also include two Vuelta a Espana victories and one in the Giro d'Italia.

England dismiss Pakistan for 110 to seize control of Lord's test
Raphinha, Fermin score as Barcelona beat Athletic in home opener
Celtic and Rangers to play cup match behind closed doors after pitch invasion
Chelsea and Fulham reach League Cup third round as Welbeck scores on debut
PSG to meet Barca, Man City as Champions League draw throws up marquee ties