Tao Geoghegan Hart has returned home for further monitoring following his crash at Paris-Nice on Wednesday.
Geoghegan Hart, 25, was pulled out of the race after reporting feeling "dizzy" following a crash on a fast hairpin bend as he contested the lead.
The Ineos Grenadiers' rider was assessed by the team's medical staff but he will be monitored at home in Andorra for symptoms of concussion.
He was in only his second race since winning last year's Giro d'Italia.
Geoghegan Hart was at the head of the race when he appeared to lose his front wheel on the inside of the corner, landing on his head as well as suffering facial and knee abrasions.
Despite jumping straight back onto his bike to continue, both rider and team have been widely praised for pulling out of a race he will have been expected to challenge for victory in, and putting welfare first.
There are wider concerns in cycling about how the sport deals with head injuries and potential concussions in the wake of serious incidents in all three grand tours last year.
AG2R La Mondiale's Romain Bardet was allowed to finish stage 13 of the Tour de France despite suffering a brain haemorrhage after a crash, in which he collapsed trying to get back to is feet.
BBC Sport understands that cycling's governing body the UCI's recently-introduced concussion protocol means that the rider would be diagnosed on the spot using the 'Maddocks' system of checking their cognitive function.
But it is difficult to implement if a rider initially feels well enough to get straight back on the bike and continue riding before team or medical staff arrive at the scene.
Work is ongoing at the UCI to instruct non-medical teams how to use this tool in such situations.