Charlie Appleby has revealed William Buick has chosen to ride Adayar in the Qatar Prix de l'Arc de Triomphe on October 3, while stablemate Hurricane Lane is yet to be confirmed for the Longchamp showpiece.
Jockey Buick had been weighing up whether to saddle Adayar or St Leger winner Hurricane Lane for the big race a week on Sunday but has opted for the Derby winner, who appears to be over a recent setback.
"It's a hard choice but William is confident he's picking the right horse," Appleby said on the Godolphin website.
"I'm always happy for jockeys to be able to choose the horse they would like to ride. That means they have confidence in the horse and they take that into the race."
Buick was on board Hurricane Lane in the Derby when he came in third as Adam Kirby rode Adayar to victory at Epsom, but Buick then took over for the King George VI And Queen Elizabeth Stakes at Ascot as he guided Adayar to another win, finishing ahead of Mishriff and Love.
Hurricane Lane's place in the Arc field is not guaranteed at this stage with Appleby admitting he has various things to consider before making a final decision, with a key factor being what conditions will be like in France on the day of the big race.
Both of Appleby's horses will be given a gallop on Saturday to check what shape they are in and the trainer admits connections will not want a fast surface for Hurricane Lane at Longchamp.
He added: "A week is a long time in racing, particularly when you are coming into a race such as the Arc.
"We obviously have to take on board the well being of both horses, but also the way the race is taking shape, and, very importantly, the ground at Longchamp.
"The one thing Hurricane Lane does not want is a quick surface. Adayar comes into the versatile category, but we have always felt ease in the ground enhances Hurricane Lane's prospects. Unfortunately, the weather in Paris is out of our hands."