Tony McCoy will not ride at next week's Punchestown Festival after sustaining broken ribs in a fall at Cheltenham on Thursday.
McCoy fell from Quantitativeeasing in the Barbury International Horse Trials Handicap Hurdle when Nicky Henderson's inmate stumbled at the second flight.
Following assessment at the track, McCoy was taken to Gloucestershire Royal Hospital, where X-rays revealed he had suffered broken ribs.
The jockey's personal assistant Gee Bradburne said: "Following the fall from Quantitativeeasing yesterday at Cheltenham, AP McCoy remains in Gloucestershire Hospital and is still very sore.
"He has broken a few ribs and was being accessed by the doctor when I spoke to him.
"Because of the discomfort, he is still under observation and the doctor will let him go home when he is happy with him.
"He will be too sore to ride at Punchestown next week."
McCoy is now likely to spend a second night in Gloucestershire Royal Hospital.
A spokeswoman for the hospital said: "Mr McCoy is in a comfortable condition, however, it does not look like he will be released this evening."