William Buick is set to appeal the eight-day suspension he picked up at Chelmsford on Thursday evening.
Buick was penalised by the stewards for his ride on the John Gosden-trained Zillion, who was beaten over 10 lengths in finishing fourth in the Bet toteexacta At betfred.com Median Auction Maiden Stakes.
The stewards inquired into the horse's performance and Buick reported Zillion had hung badly up the straight, while Gosden's representative said the handler was satisfied under the circumstances with the ride given.
A post-race check by the vet showed the colt to be lame, prompting the stewards to find Buick in breach of the rules in that "he failed to pull up a horse where it was contrary to the horse's welfare to continue as there was a problem which was materially affecting the colt's performance".
The eight days include the Craven meeting at Newmarket and valuable Good Friday cards and Lingfield and Newcastle.
Paul Struthers, chief executive of the Professional Jockeys Association, said: "I can confirm that William will be appealing."