Ballydoyle Arc jockeys confirmed Seamus Heffernan will ride So You Think in Sunday's Qatar Prix de l'Arc de Triomphe. The jockey has been aboard Aidan O'Brien's charge for his victories in the Coral-Eclipse Stakes and Irish Champion in the absence of Ryan Moore, who partners last year's winner Workforce at Longchamp on Sunday. Ann-Marie O'Brien confirmed the stable's jockey bookings on Twitter on Friday morning with Colm O'Donoghue on Treasure Beach and Joseph O'Brien aboard St Nicholas Abbey.
