Hawkbill will bypass Saturday's King George VI and Queen Elizabeth Stakes at Ascot, with next month's Juddmonte International at York his likely next target.
The three-year-old landed the Eclipse at Sandown earlier this month, supplementing his victory in the Group Three Tercentenary Stakes at Royal Ascot and extending his unbeaten run to six.
Connections raised the possibility of supplementing Hawkbill for the mile-and-a-half King George following that victory, but while trainer Charlie Appleby is pleased with the way the Kitten's Joy colt has come out of that victory, it has been decided Hawkbill will stick to 10 furlongs.
"After consultation with His Highness Sheikh Mohammed and John Ferguson, we have decided he will miss the King George and be saved for races over a mile and a quarter," Appleby told www.godolphin.com.
Meanwhile, Dartmouth has been supplemented for the race at a cost of £75,000.
Trained by Michael Stoute and owned by Britain's Queen Elizabeth II, Dartmouth won the Hardwicke Stakes at the Royal meeting over the same 12-furlong distance as Saturday's race.
The four-year-old son of Dubawi has won each of his three races this season and will be arriving at the top of his game as he tackles odds-on favourite Postponed.
Racing manager John Warren said: "The horse is in exceptional form and the trainer has been delighted with his progress since Ascot.
"With that side of things going so well, we felt he was a worthy candidate.
"Olivier Peslier, who rode him to such good effect in the Hardwicke, will ride him once again so there is continuity on that front."
Look who is back! DARTMOUTH returns to @Ascot for the King George VI after his #RoyalAscot win for The Queen https://t.co/t85DWghlow
— Ascot Racecourse (@Ascot) July 18, 2016
Dartmouth is one of 10 potential runners.
Last year's winner Postponed has been unbeaten since and has also changed trainers, now residing with Roger Varian rather than Luca Cumani.
Postponed would become the first horse since Swain in 1997 and 1998 to win back-to-back runnings.
Varian has also left in Ajman Bridge in case he needs to be used as a pacemaker following the sad loss of Roseburg, who carried out those duties in the Coronation Cup.
"Unfortunately we won't be using Roseburg, but we do have Ajman Bridge and we'll decide whether he runs when we see how the race is shaping up," Varian told At The Races.
"It's the stuff of dreams, to be heading to a race as prestigious as the King George with a horse of the quality of Postponed, it's something I would have dreamt of doing only a few years ago.
"The King George is a race I grew up watching and to be involved in it at the highest level is very exciting for me and everyone involved.
"For me it's one of the summer highlights, it's always a competitive race, and it will be, no race at the highest level is easy to win.
"Of course, Postponed's credentials are very strong and he'll need to be on his game, but hopefully he will be."
John Gosden and owner Carole Bamford had to settle for a very narrow second last year with Eagle Top and this year they send Wings Of Desire to have a go at Postponed.
Winner of the Dante at York, he went on to finish a respectable fourth in the Derby. Gosden may also run Western Hymn
Aidan O'Brien relies on Highland Reel, who was second to Dartmouth in the Hardwicke, Shogun and Sir Isaac Newton.
There is the possibility of French interest with Erupt, while Second Step is still in for Cumani.
