Richard Hannon's St James's Palace winner faded into third behind Ulysses in the Juddmonte International, having had a sustained tussle with Churchill for much of the straight.
After a thunderstorm on the morning of the race turned the ground soft, Hannon felt his stamina possibly gave out in the final 100 yards and were the ground to ride similar at Ascot, he could revert to a mile for the Queen Elizabeth II Stakes.
"He ran a good race. I'm not blaming James (Doyle) because he gave him a lovely ride, but they did get racing a long way out and possibly set it up for the winner, who is a very good horse by the way," said Hannon.
"I think we'll come back to a mile on Champions Day if the ground is on the soft side, but were it to ride good I'd have no trouble in running him over 10 furlongs again.
"He'll definitely be running on Champions Day in either the QEII or the Champion Stakes, he's come out of the race in good form.
"Whichever race he runs in, he'll run well."