Nathaniel has been added to the King George VI And Queen Elizabeth Stakes field at Ascot on Saturday at a cost of £75,000.
John Gosden's colt was an impressive winner over the same course and distance in the King Edward VII Stakes at Royal Ascot.
Having skipped the Derby on account of fast ground, and also the Grand Prix de Paris last week, connections have taken the bold step to run him against older horses.
And the test could not be much sterner as last year's Derby and Arc winner Workforce, Coronation Cup scorer St Nicholas Abbey and Prince of Wales's Stakes victor Rewilding are all set to run in a potential seven-runner ensemble.
Michael Stoute's yard is now in much better form, which will give Workforce's fans new hope after he was narrowly defeated by So You Think in the Eclipse.
Rewilding, on the other hand, wore down So You Think over 10 furlongs in the Prince of Wales's, and is expected to be even better still over a mile and a half.
Debussy could run in the same colours to ensure a true test.
St Nicholas Abbey has returned to his brilliant best this season and defeated Midday by a length at Epsom, with Henry Cecil's multiple Group One-winning filly another possible this weekend.
It is, however, unlikely she will run if Workforce lines up as they are in the same ownership.
Aidan O'Brien has a strong second string in Seville if anything untoward were to happen to St Nicholas Abbey this week.
Rewilding carries plenty of stable confidence as he steps back up to his optimum trip.
Trainer Mahmood Al Zarooni said: 'The horse is very well after winning the Prince of Wales's at Ascot.
'I think he has physically changed from three to four years old. When he was three, races took a lot out of him. This time he is stronger.
'A mile and a half is his best distance so that is why we are really confident. I wasn't surprised that much at Ascot as they went a really fast pace which has helped him.
'They got tired and he was the one that kept going as he is a mile-and-a-half horse. Good ground would suit him and fast ground would suit him.'