Adrian Heskin is facing a spell out of the saddle after fracturing his collarbone at Fairyhouse on Sunday.
Heskin fell from Huntmaster at the eighth fence of the Ryan’s Cleaning Specialist Beginners Chase.
He had been due to ride A New Story for Michael Hourigan in the Ladbrokes Irish Grand National.
Barry Geraghty took a fall from Good Time Donie in the INH Stallion Owners EBF Novice Handicap Hurdle Series Final and aggravated an old shoulder injury.
Geraghty was not in action on Monday, due to a suspension he incurred at Aintree, and aims to be back for the Punchestown Festival.