He said: "I was devastated to learn of the death of Michael O'Sullivan earlier today and speak for all involved in British racing when I say that our thoughts and deepest condolences are with his family and friends at this awful time.
"Everyone's thoughts are with Michael's parents William and Bernadette, his brother Alan, his wider family and with his many friends and colleagues.
"Our thoughts and prayers are with Michael's family and friends, his weighing-room colleagues and the Irish racing community.".
A statement from the Professional Jockeys Association in Britain read: "The PJA and its members are heartbroken to hear that jockey Michael O'Sullivan has died following injuries sustained in a fall at Thurles.
"Coming from a background steeped in racing, Michael made his start in the point-to-point field while a secondary school student and he made his name on the racecourse with a university degree under his belt.
