Glen's Diamond and Royal Diamond, first and third in last month's Yorkshire Cup, feature among 10 possibles for the At The Races Curragh Cup at the County Kildare course on Sunday.
The former, trained by Richard Fahey, was winning for the first time since the Dee Stakes in May 2011, while Johnny Murtagh's Royal Diamond, last year's Irish St Leger hero, showed distinct signs of a return to form at York.
John Oxx has Call To Battle, Oliver Brady has Zafarqand and Dermot Weld may rely on Voleuse De Coeurs.
The potential field is completed by Midnight Soprano, who landed the Group Three Noblesse Stakes at Cork last week.
Her trainer Paul Deegan has yet to decide whether she will take her chance or perhaps wait for the Lancashire Oaks at Haydock on Saturday week.
"We're not sure yet. We might go for the Lancashire Oaks. We are still weighing up the options," said the Curragh handler.
"She's in super order and we're very happy with her. We'll decide in a day or two where we go. I'm not sure yet."