Dermot Weld is leaning towards a tilt at the Jersey Stakes at Royal Ascot for Mustajeeb following his fine effort in last month's Irish 2,000 Guineas.
The Nayef colt kicked off the season with a runaway victory against his elders in the Group Three Amethyst Stakes at Leopardstown and picked up minor honours in Classic company behind British raiders Kingman and Shifting Power.
Mustajeeb could again take on Kingman in Tuesday's St James's Palace Stakes, but is likely to turn out the following day for the Jersey.
"Mustajeeb is very well and I'd say he's more likely to go for the Jersey. I think the Guineas form is very solid and I'd say he could represent us well," Weld told At The Races.
Mustajeeb is set to be part of a small but select raiding team from Rosewell House at next week's showpiece meeting.
Pale Mimosa looks set to take her place in the Gold Cup, while Hisaabaat is poised to run in the Ascot Stakes.
Athasi Stakes winner Flying Jib could also travel for the Sandringham Handicap, but Weld has not yet confirmed her participation.
He said: "Hisaabaat is fairly certain to run. He has 9st 3lb at the moment. He's a consistent, dual-purpose horse who could have a good chance.
"I haven't decided whether we'll run Flying Jib yet. It's a 50-50 chance."