Tony McCoy faces a spell on the sidelines after sustaining cracked ribs at Taunton on Friday.
McCoy suffered a final-fence fall aboard Laudatory in the Steve Logan Memorial County Contractors Handicap Hurdle.
The 16-times champion jockey gave up his final ride of the day, Hopeful Start, in the totetrifecta Handicap Chase.
A shaky-looking McCoy was later taken by ambulance on a stretcher to Musgrove Park Hospital, Taunton.
McCoy later confirmed he had sustained broken ribs.
He tweeted: "Broke a few ribs so not too bad and hopefully back to work very soon.
"Just need the doctor to let me out of the hospital now and I'll be happy."
McCoy was due to be in action at Warwick on Saturday, where he had four rides.
Betfair have confirmed a technical fault with a "bot" was to blame for the remarkable betting patterns that took place during Wednesday's woodiesdiy.com Christmas Hurdle at Leopardstown.
The betting exchange eventually voided all in-running bets on the race after one customer, who Betfair have also confirmed was UK-based, laid easy winner Voler La Vedette for £21,474,836 at 29 (28/1).
This would have left the customer with a maximum liability of close to £600million.
A statement from interim Betfair CEO Stephen Morana read: "This bet was placed by one of our UK customers trading the race via our API or Application Programming Interface using an automated program (a 'bot').
"Their bot had developed a fault causing it to try and place a very large number of bets on the exchange.
"This was triggered because of a unique sequence of events that had never happened before."
Champion Court will try to make it third-time lucky at Cheltenham this season during tomorrow's Cheltenham Pony Club Raceday Novices' Chase.
"He's been running really well," said trainer Martin Keighley.
"It's only a small field on Sunday, but it looks another really hot race."
Robert Waley-Cohen expressed his delight at news that his son Sam will be available to ride at Newbury on February 11 should Long Run have a prep run for the Cheltenham Gold Cup.
The jockey was banned for 12 days for pulling up Otage De Brion a circuit early at Fakenham but the suspension only applies on days when there are races for amateur riders.
"Sam will be free on the 11th of February to ride in the Denman," said Waley-Cohen senior, the owner of Long Run. "All roads lead to the Gold Cup."