Ryan Moore is to ride Aidan O'Brien's "main horses" this season
Top class flat jockey Ryan Moore has been confirmed by Aidan O'Brien as his number one rider for the coming season.
Moore will ride the "main horses" for the powerful Ballydoyle yard in the new season.
The announcement all but confirms Joseph O'Brien's long-standing battle with the scales. The 21-year-old, who has ridden two of the past three winners of the Derby for his father, has struggled to keep his weight below nine stone.
He recently went jumping over fences for the first time, and his father said he will continue to do so in the near future.
Ryan Moore has ridden regularly for Aidan O’Brien in the past and steered Ruler Of The World to victory in the Derby in 2013. He also won the 1,000 Guineas in 2012 on the stable's Homecoming Queen.
Speaking to the Racing Post on Thursday evening, Aidan O’Brien confirmed the news: “Ryan will be riding our main horses this year and Joseph will be riding other horses when the weights allow him to.
"Seamie Heffernan and Colm O’Donoghue will also be involved as in the past. I’d imagine that if he wants to, Joseph will continue to ride over hurdles.”
Moore's first ride for O'Brien since the announcement will be at Leopardstown on Sunday, where he saddles John F Kennedy.