The Grey Gatsby faces the stiffest test of his stamina to date as he lines up in Sunday's Juddmonte Grand Prix de Paris at Longchamp.
Kevin Ryan's charge shone over 10 and a half furlongs when landing the Prix du Jockey Club at Chantilly last month, supplementing his previous mile-and-a-quarter verdict in the Dante Stakes at York.
The son of Mastercraftsman will be stepping into the unknown, however, as he shoots for Group One glory over a mile and a half, with Ryan believing there is every chance his charge will stay.
"He wasn't stopping last time, it was a hands and heels ride, Ryan (Moore) didn't have to hit him, so I think there's a good chance he'll get a mile and a half. It's a difficult race but I think the big factor is how easily he's switching off in his races," he told At The Races.
"That's the big factor going a mile and a half. After this, he'll go back to a mile and a quarter, and the Juddmonte's the plan."
Moore will again be in the plate as The Grey Gatsby faces 10 rivals, including the John Gosden-trained Marzocco.
He finished second in Derby trials at Epsom and Goodwood but skipped a Classic date in favour of a run at Royal Ascot.
Tried over two miles in the Queen's Vase, Gosden felt his charge did not quite stay in finishing third.
Gosden said: "I don't think he stayed in the Queen's Vase and that why we are bringing him back to a mile and a half.
"He won't mind the ground, it was soft at Goodwood (when he finished second in a Listed event). It's a nice little race for him and I think it's quite open."
Jean-Claude Rouget's Prince Gibraltar is the likely favourite after finishing a luckless third to The Great Gatsby at Chantilly.
Free Port Lux finished well down the field that day but tries his luck once again.
Auvray has won three of his four starts for Elie Lellouche this term and he is another for the shortlist along with Andre Fabre's Golden Guepard, who is a half-brother to 2011 French 1000 Guineas and Oaks winner Golden Lilac.
Machucambo is seeking a fourth win on the bounce for Christophe Ferland with Fabre also fielding Gallante, while Teletext, Guardini and Prince Nomad complete the field.