Irish training genius Aidan O'Brien trained seven winners at Royal Ascot to be leading trainer while Joseph has had his best-ever results at the famous carnival training five winners.

Their attention now turns to The Curragh where the Ballydoyle master is aiming for an extraordinary 18th Irish Derby and has as many as five starters including English Derby winner Christmas Day and Benvenuto Cellini, the controversial "non-runner" at Epsom.

O'Brien told Racing Post that Benvenuto Cellini "seems fine, he's been 100% since he got home" after Epsom when the Derby favourite was declared a non-runner after getting his hind leg caught up in the barriers at the start.

"We didn't learn anything about him at all at Epsom. It wasn't conclusive in any way,'' O'Brien said.

"He was obviously slow away and then trapped wide. He was stopped in his run in the straight and it just didn't happen for him on the day.

"He's such a beautiful mover, but he didn't get a chance to show it on that ground.''

The champion trainer can't fault Christmas Day after his convincing English Derby win.

"Christmas Day is great, there's not a bother on him,'' he said. "His form was there for all to see. He's a real genuine colt and keeps galloping, he's relentless.''

Christmas Day is by Camelot who Joseph O'Brien rode to win the English Derby-Irish Derby double in 2012.

But Joseph O'Brien is in the opposing corner to his father on Sunday when saddles up English Derby minor placegetter James J Braddock in the Curragh classic.

"I think he's come on well from Epsom," Joseph O'Brien told English media.

"He obviously didn't behave brilliantly on the day but at least he ran very well. I think the occasion and the race has brought him forward.

"He's an exciting runner in what looks like it's going to be a competitive Irish Derby."

The young trainer also revealed his freakish English Oaks winner Thundering On is likely to contest the Group 1 Pretty Polly Stakes at The Curragh on Saturday.

"Thundering On might come back in the Pretty Polly, she seems to have pulled up very well from Epsom,'' he said.

Photo: Pat Healy Photography