Hugh Bowman will take the reins on Cox Plate winner Adelaide in a barrier trial but the association may be brief.

Pending international commitments and the horse's program, Englishman Ryan Moore will have first call on race day.

Moore was aboard when the four-year-old made history as the first overseas-trained horse to win the Cox Plate for champion Irish trainer Aidan O'Brien.

He is raced by a group which includes Coolmore partners Derrick Smith and Michael Tabor and John Magnier's wife Sue.

Adelaide has remained in Australia in the care of Chris Waller and will have his first public outing since October when he runs over 900 metres on Tuesday.

Waller is taking things one day at a time heading to the $4 million Queen Elizabeth Stakes at Randwick on April 11.

"He has settled into the stable really well and is a pleasure to work with," Waller said.

"He is obviously a horse of quality which he has already proved in Australia by winning the Cox Plate.

"He is a gentleman of a horse."

Waller said after Tuesday, Adelaide may be given another trial before he goes to the races.

"I'm not sure where he will kick off," he said.

"The Queen Elizabeth is his race but how we get there has yet to be decided.

"I'm conscious not to overdo it. I want to have a horse to send back to Aidan."

All going to plan, O'Brien will take over again when Adelaide returns to Europe with Royal Ascot a target.

Adelaide won the Group One Secretariat Stakes in Chicago on his way to Australia and his owners are keen to add a European victory to his wins in the United States and Australia.

While O'Brien will be in charge if Adelaide runs at the Royal meeting in June, Waller will be there with one of his own.

Sprinter Brazen Beau, who resumes in Saturday's Lightning Stakes, is being aimed at the Diamond Jubilee to enhance his dual hemisphere stallion prospects for his new owners Darley.