Raul da Silva has been suspended for 21 days for "violent conduct" following an "altercation" with 2016 champion jockey Jim Crowley after the first race of the day at Goodwood.
A statement issued by the British Horseracing Authority stewards said that Da Silva "had struck Crowley in the face, causing an injury which required medical treatment".
Da Silva and Crowley rode in the opening seven-furlong handicap, in which the former finished last aboard Medieval. Crowley came home fifth of the nine runners on Charles Molson.
The BHA stewards' statement read: "An inquiry was held following a report of an altercation in the changing room between Raul da Silva and Jim Crowley following race one.
"Da Silva, Crowley, Martin Dwyer, John Egan, Jack Mitchell, Richard Kingscote, two valets, the clerk of the scales, the changing-room doorman and the racecourse medical officer were interviewed.
"After hearing their evidence, Da Silva was suspended for 21 days for violent conduct, in that he had struck Crowley in the face causing an injury which required medical treatment.
"The evidence of all parties was noted, and they were advised that should any further evidence become available, the stewards reserved the right to revisit the matter."
