Dettori, who had been due to ride in the Prix de l'Arc de Triomphe on Sunday, was unseated from his horse Eland Ally on the way to the start of a race in Nottingham.
"Sunday is out - as is the season," Dettori's spokesman Peter Burrell was quoted as saying by the BBC.
One of the biggest names in the sport, British-based Italian Dettori ended a six-month ban for doping in May.
(Reporting by Toby Davis; editing by Greg Stutchbury)
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