Inglenook has been supplemented at a cost of £20,000 for the St James's Palace Stakes, the feature race on the opening day of Royal Ascot on Tuesday.
The John Dunlop-trained colt is the only horse added to the Group One contest, for which there is another forfeit stage tomorrow.
Inglenook has won two of his three races this season, following up a Kempton maiden success in May with victory in the Listed Heron Stakes at the same course later that month.
The three-year-old's likely rivals next Tuesday include Godolphin's duo Bachir and China Visit, Sagitta 2000 Guineas runner-up Giant's Causeway and Henry Cecil's unbeaten Shibboleth.
Dubai Millennium is on track for Wednesday's Group One event according to Saeed bin Suroor.
"He is very well and has improved since last year," said the Godolphin trainer.
"Everything is well, he is sound, healthy, in good condition and great form."
Ground conditions, which are currently good to firm with a penetrometer reading of 2.6 according to clerk of the course Nick Cheyne, will prove no handicap to the colt's chances of victory.
"He is better on softer ground but won on good in Dubai and he won a trial at Newmarket on good to firm 10 days ago when there were no problems with the ground, he won on the bridle.
"He looked a professional horse. He is different class."
The trainer welcomed the likely addition of Sendawar to next week's field.
"I like to see good horses run against Dubai Millennium," he said. "It shows how well he is."
Bin Suroor was also upbeat about the chances of Aljabr in the Queen Anne Stakes, along with Bachir and China Visit who meet each other in the Group One St James's Palace Stakes.
"Aljabr has come back from his rest and is very well," he said.
"Both China Visit and Bachir have done very well. Over nine furlongs China Visit looked better than Bachir, over a mile it would be perfect for him."
The trainer feels rain would increase the chances of Kayf Tara in the Gold Cup.
"He's done very well since York," he said. "He is a professional who is brilliant in his work.
"However, he would like to go in the soft really."
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