Robbie McNamara was described as being in "very good spirits" in hospital in Dublin on Sunday as he recovers from serious injuries suffered in a fall at Wexford on Friday.
The jockey was due to partner last year's Cheltenham Gold Cup winner Lord Windermere in the Crabbie's Grand National at Aintree, but suffered multiple injuries when coming to grief in a fall from Bursledon four out in the first division of the Cahore Point Handicap Hurdle.
"He was very stable overnight and in very good spirits. He doesn't want to say any more at this stage and you can understand that," said Dr Adrian McGoldrick, chief medical officer for the Irish Turf Club.
"It was serious chest, abdominal and spinal injuries. The spinal injuries have been operated on and that's stabilized. The next phase is recuperation and we'll take it from there."
Speaking on At The Races, McGoldrick paid tribute to the medical care McNamara received in the immediate aftermath of his fall.
He said: "In Wexford he got fantastic care on the track, and in the casualty department Mr Ken Mealy, the surgeon there, was fantastic. They saved his life, being very honest.
"He was then transferred to the Mater (in Dublin) and he was taken care of very well, had successful surgery yesterday and we go forward from there.
"We are in the initial stages of his post-operative recovery, so it's much too early to be giving a prognosis as to the future, but he's come through surgery well and we're very happy with how he's doing."
McGoldrick added that Davy Condon, who was taken to hospital with concussion following the National after a fall from Portrait King, was set to return home on Monday.