Proclamation will again have the services of Frankie Dettori, who rode the colt to victory in the listed Empire Property Group Cup S. (registered as the Heron Stakes) in May. The charismatic jockey recently returned to riding after breaking his collarbone, and replaces Mick Kinane, who is on the sidelines with a broken wrist.

Other contenders include Somnus, who will compete in this race for a third straight year. The Tim Easterby-trained colt won this event in 2003 and fell just a head short in last year's renewal. La Cucaracha, the speedy filly from the stable of Barry Hills, will also be trying to add to her group I collection. She won the five-furlong Nunthorpe Stakes (Eng-I) in her last start. Michael Hills, son of the trainer, has the return call. His brother, Richard, will be aboard stablemate Etlaala, who was third in the group I July Cup.

Also on Saturday afternoon, the brilliant filly Ouija Board was set to make her highly anticipated return in the 12-furlong September Stakes at Newmarket. However, the 4-year-old filly will now miss the group III event, due to an unsatisfactory scope Wednesday morning. The champion filly has been postward only once this season, sustaining an injury in the group I Prince of Wales's Stakes at Royal Ascot in June. Trainer Ed Dunlop is hopeful that the Cape Cross filly will bounce back quickly enough for a run in the group I Prix Vermeille at Longchamp on September 11. The Prix Vermeille is run at the same mile and a half distance as the Prix de l'Arc de Triomphe (Fr-I), which has been a major target for the filly this season. A return to the Breeders' Cup World Thoroughbred Championships will follow, with either a defense of her title in the Emirates Airline Filly & Mare Turf (gr. I), or a try at open company in the John Deere Turf (gr. I).