Barry Potts, a trainer from Co Down, who was best man at the rider's wedding, revealed JT was considering giving up racing after this month's meet at Punchestown.
The amateur jockey fractured two vertebrae when his horse fell in a race at last month's Cheltenham festival.
He remains in hospital but has been told he is paralysed from the neck down.
"Hopefully, that's just the worst case scenario that they've given him," Mr Potts said.
"Fingers crossed, he'll get something moving.
"He's pretty strong-minded, he'll be determined," Mr Potts told BBC radio, Northern Ireland.
Mr Potts recalled how his friend had been a prolific rider, claiming over 600 victories in point-to-point meetings and about another 100 on the track as well.
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