Ruby Walsh will be out for at least two months as he recovers from a broken arm sustained from a fall in Saturday's Aintree Hurdle.
The leading jockey was taken to hospital after Celestial Halo crashed out, at which stage he was then kicked by Won In The Dark.
He missed riding Big Fella Thanks in the Grand National and returned home to Ireland that evening.
Walsh went to see his orthopaedic surgeon this morning and his sister and agent Jennifer said: "He went to see (surgeon) Bill Quinlan this morning.
"The arm is in plaster and he is going to be out for eight to 10 weeks."