Tony McCoy will have to get the all-clear from the on-course doctor before being allowed to ride at Warwick today.
The Ulsterman, who smashed through the 4,000 winner mark earlier this month, took a tumble from 10-11 favourite Dursey Sound in the At The Races Novices Limited Handicap Chase at Fakenham, a race won by King Of The Wolds.
McCoy managed to keep the market leader in the fight and was almost upsides King Of The Wolds jumping the last, but the perennial champion jockey was sent to the turf when his mount made a bad mistake.
Fakenham clerk of the course David Hunter said: "The physio and doctor saw him before he went home.
"He's got a sore back and will have to pass the doctor."
Meanwhile, Paul Carberry returns to competitive duty with three rides at his local Fairyhouse track today, over six months after he was last seen completing a sparkling Ballinrobe treble.
The 39-year-old ex-champion jockey's recovery after key-hole surgery on a troublesome shoulder was slower than anticipated.
"I knew it was going to take a long time, but I didn't think it would be this long," Carberry explained.
"It had to be done and I just had to mind it for a while, but I've been back riding out for a couple of months now, so hopefully I'm fit enough. I can't wait to get back. I've never been as excited to get back race-racing again."
His enthusiasm shouldn't be dampened any after his comeback aboard Ally Cascade in the conditions hurdle, as Noel Meade's Gigginstown Stud-owned five-year-old is fancied.
Ally Cascade plundered a bumper here in style last autumn, chased home by none other than Jezki, who won under McCoy at the Down Royal Festival.