Hall takes on 10 in Guineas
Parish Hall heads a field of 11 for the Abu Dhabi Irish 2000 Guineas at the Curragh on Saturday.
Not seen since winning the Dewhurst as a juvenile, Jim Bolger's colt is also in the mix for the Investec Derby.
Speaking by telephone at Epsom's Breakfast With The Stars event on Thursday morning, Bolger said: "It looks like Aidan's horse (Camelot) is the one that everybody has to beat in the Derby.
"We will have some idea on Monday (whether Parish Hall will go for the Derby) but it will have had to clarify itself by Wednesday.
"We would be thinking Royal Ascot if we didn't come, it would suit his schedule, but I'm very keen to get to Epsom."
Aidan O'Brien, looking for his fourth Irish 2000 Guineas win in five years, will field four runners - Power, Wrote, Daddy Long Legs and Reply.
John Oxx has two live chances with Takar, the mount of Johnny Murtagh, and Sea The Stars' half-brother Born To Sea, who will be ridden by Pat Smullen.
The Richard Hannon-trained Trumpet Major will be joined by Bryan Smart's Foxtrot Romeo as the only two British challengers. Hermival, third in the Newmarket equivalent, will travel over from France, with Alkazim, trained by David Wachman, completing the field.