Concussed Rock out of Sprint
Society Rock has met with a setback and is unable to defend his crown in the Betfred Sprint Cup at Haydock on Saturday.
The James Fanshawe-trained six-year-old, who beat Gordon Lord Byron last September, suffered a bang to the head on Sunday.
"Society Rock had a fall (on Sunday afternoon) and suffered a bang to his head," read a statement posted on www.jamesfanshawe.com.
"He has some concussion and is receiving medical treatment from the vets at Newmarket Equine Hospital. He remains at Pegasus Stables, is bright, standing up and eating.
"We will continue to receive medical treatment and will require careful management over the next few days."
Society Rock showed he had lost none of his spark when making a successful seasonal debut in the Duke of York Stakes on the Knavesmire in May.
He has since finished second to Lethal Force, whom he beat at York, in both the Diamond Jubilee Stakes and the Darley July Cup.