Rider Andrew Nicholson has undergone neck surgery after falling at the Festival of British Eventing at Gatcombe Park on Sunday.
The New Zealander, who has three Olympic team medals to his name, was on board Cillnabradden Evo when he suffered the fall.
The 54-year-old was taken to hospital in Swindon before being transferred to John Radcliffe Hospital in Oxford.
On Tuesday, a statement from Nicholson's family was released to Horse & Hound, and it read: "Andrew underwent surgery to repair the injury to his neck.
"The surgery went well and his condition is stable. Andrew is comfortable and has full range of movement. His family would like to thank the many well-wishers."
Nicholson has also won three world titles in his career.