"Wrist injury" for Ryan Moore
Moore had been due to partner the Sean Woods-trained colt in the Group One at Sha Tin, but has sustained an injury to a wrist.
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Tom Queally has been pencilled in to deputise, according to Hong Kong Jockey Club executive director William Nader.
A statement issued by the Hong Kong Jockey Club read: "The stewards have been advised by Mr Woods that jockey Moore has subsequently become indisposed due to a wrist injury and consequently will not be able to fulfil the intended riding engagement on Autumn Gold."