Jockey Conor Brassil was taken to hospital after suffering a suspected broken leg in a fall in the final race at Fairyhouse.
The 5lb claimer, son of Grand National-winning trainer Martin Brassil, was partnering Demi Plie in the two-mile handicap hurdle when his mount came to grief at the third flight.
Brassil received attention from on-course medical staff and was then taken to hospital for further assessment.
Martin Brassil said: "It's not confirmed but it looks like he's broken his leg. It's below the knee on the shin bone.
"He's not long been back from injury and 2017 hasn't been a great year for him, but he's coming out the other side."