After yesterday's decision to switch Montjeu to Longchamp on Sunday, Giant's Causeway is expected to bid to win his fifth Group One race of the season in Saturday's ESAT Digifone Champion Stakes at Leopardstown.
The three-year-old's trainer, Aidan O'Brien, said yesterday: "Giant's Causeway will do a nice swinging canter in the morning and if we are happy with him we'll declare him for Leopardstown.
"I would like to run him, obviously, but I just want to see how he is after the spin before we make our final decision. If he runs we'll run something else, what that will be we don't know yet.
"If Giant's Causeway runs in the Champion, at this stage, Lermontov could run in the Listed race at Leopardstown and that would mean Rostropovich would probably run in the St Leger and Joplin would run in the Flying Childers."
George Duffield is on stand-by to partner O'Brien's Leger hope.
Rostropovich, who finished last of five behind Royal Rebel in the Group Three Lonsdale Stakes at York on his latest start, is a best-priced 50 to 1 with William Hill for Doncaster.
John Oxx's dual-Derby winner Sinndar is on course to stake his Prix de l'Arc de Triomphe claims in the Group Two Prix Niel at Longchamp on Sunday. "He's in good form and ready for a run," the Curragh trainer said yesterday.
The son of Grand Lodge, not seen out since winning the Budweiser Irish Derby by nine lengths from Glyndebourne at the beginning of July, will have the benefit of a pacemaker, as stablemates Raypour and Takali were among the 10 acceptors.
"I'll run another to make sure there is a decent gallop," Oxx added. "You so often see a slow pace, particularly in the Prix Niel - Montjeu nearly got beaten last year - it won't be like that this time."
Sobieski, Andre Fabre's impressive Prix Eugene Adam winner, also stood his ground together with stablemate Crimson Quest.
The remaining quintet are Kutub, Bonnet Rouge, Lycitus, Lermontov and Kathmandu.
Montjeu, who looks set to warm up for the Arc in the Prix Foy, was one of nine acceptors for the Group Two contest.
Possible rivals for John Hammond's champion include Indian Danehill and Russian Hope, winners respectively of the Prix Ganay and Grand Prix de Deauville.
The mile-and-a-half race also remains an option for the British trio, Golden Snake (John Dunlop), Commander Collins (John Gosden) and Ela Athena (Michael Jarvis). Completing the list are Mayaro, Robertico and Crillon.
The third of the recognised Arc trials, the Prix Vermeille, may feature a clash between the respective English and French Oaks winners, Love Divine and Egyptband.
Godolphin's Melikah, the Irish Oaks second, Clive Brittain's Shamaiel, and Aidan O'Brien's Chiang Mai are also amongst the 14 fillies still in the Group One contest.
