Darwin Atapuma of UAE Abu Dhabi and Vincenzo Nibali of Bahrain Merida were involved in a heavy crash with 3km to race in stage 2 of the Vuelta a San Juan.
The Colombian has suffered “cervical trauma and face abrasion” with an ambulance taking him to hospital where he remains under observation.
“Rider Darwin Atapuma (UAE Abu Dhabi), crashed during the stage, suffers of a trauma with a temporary lost consciousness. He was transferred to the Hospital El Castaño, where they made a scan of brain, spinal column and chest. No lesions found,” reads a statement.