Twenty-time champion jockey AP McCoy: “Absolutely devastated to hear the sad news of Michael O’Sullivan’s passing. A dedicated and very talented young man taken far too young. Sending my deepest condolences to his family and friends at this heartbreaking time.”

British jockey Harry Skelton: “Absolutely devastating news to hear Michael O’Sullivan has passed away. My thoughts are with his family, friends.

“When you go through that door to race you all want to come back in it together – his peg now sits empty for all the wrong reasons. Thinking of all the Irish weighing room.”

Irish trainer Gordon Elliott: “Sending our deepest condolences to the family, friends and colleagues of Michael O’Sullivan. Rest in peace.”

Irish Jockeys Association secretary Andrew Coonan: “Jockeys face the risks of race riding every day, but it is only when a tragedy like this befalls us that those full risks are truly realised.

“Michael was not only a highly talented rider but also a great friend and colleague to many in the weighroom. We are all the richer for having known him, even though his time with us was far too short.”

British trainer Ben Pauling: “Just the worst news to wake up to. Quite clearly a huge talent within our sport and will be sorely missed by so many. Our thoughts are with his family and friends. Fly high Michael.”

British champion jump jockey Harry Cobden: “Absolutely devastating news about Michael O’Sullivan. Sending my deepest condolences to his family and friends. Rest in peace.”

British Horseracing Authority acting chief executive Brant Dunshea: “I was devastated to learn of the death of Michael O’Sullivan 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.

“The bonds between the British and Irish racing communities are deep and this unspeakable tragedy will doubtless have a profound impact on many people on both sides of the Irish Sea.”

Taoiseach (Irish prime minister) Micheal Martin: “Deeply saddened to learn of the tragic death of jockey Michael O’Sullivan. A talented rider who inspired many. My sincere sympathies go to Michael’s family, his friends and colleagues in the racing world.”