Both riders were involved in Wednesday's crash that decimated the peloton on the third stage of the tour.
Another victim, Frenchman Julian Alaphilippe, among the race
favourites, was forced to pull out of Thursday's fourth stage as a
result of injuries sustained in the crash, his team, Deceuninck-Quick
Tour de France winner Thomas was able to remount and finish
Wednesday's stage but Castroviejo was taken to hospital and underwent
"Jonathan has a fracture of his right clavicle, as suspected," team doctor Inigo Sarriegui said.
"One of his ribs is fractured, he has a very small fracture on his
left wrist, and he has a stable fracture of parts of his vertebrae."