Jack Kennedy sustained a broken leg in a fall at Punchestown last night and will be out of action for four months.
The 18-year-old rider suffered a heavy fall when parting company with Bobbies Diamond in the opening Novice Chase.
Kennedy was taken by ambulance to Naas General Hospoital where it was confirmed that he's suffered a fractured left femur.
Turf Club senior medical officer Dr Adrian McGoldrick said that while Kennedy was in great deal of pain, he was in reasonable spirits, and was targeting a return to action at the Listowel in mid September.
"He's going to have surgery this afternoon when they will put a nail through the bone," said McGoldrick.
"Four months is about the average recovery time for this kind of injury and it is a clean break.
"I'm sure he will respond well, but it's not at all like his other breaks as they were small bones and this is the biggest bone in the body."