Footage of the incident which involved a beer can thrown in the direction of Tony McCoy at Worcester on Friday evening is to be handed over to West Mercia Police.
McCoy, who had ridden four winners earlier on the card, was returning on the beaten favourite Saint Helena after finishing second in the final race.
Eyewitnesses reported a racegoer shouting abuse at the champion jockey and an empty beer can being thrown. There was no intervention by the stewards as the man did not encroach on to the course, but he was escorted off the racecourse.
Kate Hills, director of public relations and communications of Arena Racing Company, which owns Worcester, said: “The racecourse have footage of the incident on a DVD. This is being passed on to the police force in an attempt to try to identify the racegoer. The police have the facility to blow the footage up so that will hopefully make identification easier.”
Looking ahead to this weekend’s action, Basateen has been forced to miss Saturday’s Juddmonte Royal Lodge Stakes at Newmarket with a minor injury.
The highly-regarded Hamdan Al Maktoum-owned juvenile was a short-priced favourite for the Acomb Stakes at York but could only finish third behind Dutch Connection and Toocoolforschool.
Trainer Richard Hannon said: “He was out in the paddock rolling in the sun and where he’d been pawing at the ground he dug up a little flint and then sat on it and had to have three stitches.”