Cheltenham Gold Cup and Grand National-winning jockey Russell was taken to hospital for precautionary X-rays on a suspected shoulder injury after a heavy fall from Doctor Duffy at the first fence in the Munster National.
However, his injuries turned out to be more severe.
Kennedy, who only recently returned from a broken leg suffered at the Dublin Racing Festival at Leopardstown in February, fell three flights from home when partnering Etincelle Lioterie in the opening Listed novice hurdle.
An update from the Irish Horseracing Regulatory Board’s senior medical officer Dr Jennifer Pugh posted on Twitter read: “Davy Russell sustained a neck injury and has a fracture of his C6 vertebrae. Jack Kennedy fractured his left collarbone.
“Unfortunately they will both be out for a number of weeks.”
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