In what might be an ominous portent of what is to come, City Of Troy “should have no problem over a range of distances” this season, according to Aidan O’Brien.

The unbeaten Justify colt enters his Classic year with a sky-high reputation and ranked second only to Johannesburg – a four-time Group One-winning juvenile – among O’Brien’s 13 champion two-year-olds to date with a rating of 125 following the unveiling of the European classifications.

“He looks very exciting, obviously, and he looks like he’ll have no problem going up in distance,” said O’Brien of the Dewhurst winner, who is favourite for the 2000 Guineas and Derby and has even been talked of as a potential Triple Crown horse.

“I suppose from the first time he ran he looked something different and we always felt that he was a horse who should go forward from two to three, so he’s very exciting from that point of view.

“Johannesburg was more of a two-year-old, he was a small horse. This horse has a massive big, long stride, a bigger horse and obviously he looks very exciting.

“He’s made good physical progress, we’re very happy with him. He’s not too big a horse, he’s not too small, he’s medium-sized and a lovely, well-balanced horse, he’s got a lovely mind. He’s moving very well and he looks like a horse who should have no problem over a range of distances.

“I suppose what makes him different is the tempo he goes in a race and then he just kicks into another gear at halfway, really.

“We didn’t have a horse as exciting ever as City Of Troy as a two-year-old, probably.”

O’Brien enjoyed notable success from a relatively small sample with offspring of American Triple Crown hero Justify, and he floated the idea of taking some of them out to the States to race on dirt.

“We will definitely consider taking the Justifys to America. I would imagine they will be made for the dirt, Justify was a big dirt sprinter who got a mile and a half, but that is why he’s so exciting, they are as good on turf as dirt,” said O’Brien.

“The Kentucky Derby is unlikely as we might not have anything forward enough for that, but after that, once the Classics are out of the way, there’s every chance we could travel over with some of them.”

City Of Troy was rated 5lb clear of Bucanero Fuerte, trained by Adrian Murray, while just 1lb behind him was another O’Brien inmate, Henry Longfellow, also unbeaten in three races.

“We always thought they were two very good colts but we never put them together,” said O’Brien.

“Both travel very well and quicken very well. City Of Troy has a lower action, while Henry Longfellow bends his knee a little bit.

“Henry Longfellow was impressive in his three runs but what City Of Troy did, he always looked different.

“We were thinking at the moment, although obviously it can change, of starting City Of Troy at Newmarket and we’re thinking of maybe starting Henry Longfellow in France.”

The leading two-year-old filly for 2023 was another Ballydoyle inmate, Opera Singer, a five-length winner of the Prix Marcel Boussac.

“I think we’ll probably start her in the English Guineas. Physically she’s done very well, she’s at the same stage as City Of Troy at the moment,” said O’Brien.

“We’ll probably split them up, one might go to France and one might go to England, her and Ylang Ylang (Fillies’ Mile winner), that’s what we’re thinking at the moment.

“She’s a Justify and they are very versatile but she’s out of a Sadler’s Wells mare (Liscanna) and we didn’t think she’d have any problems handling an ease in the ground. We were hoping good ground would bring out the best in her.”

Opera Singer is a half-sister to Hit It A Bomb and Brave Anna, who both won Group Ones at two but failed to train on at three.

“I suppose she’s by Justify which is the massive thing and Justifys improve a lot a three, that’s what we’re thinking. She’s much bigger than they were, scopier, so I think the Justify factor will make a massive difference to her,” said O’Brien.

“When you look at a horse you can tell physically if they have changed from two to three, first impressions is always the thing. Some might get heavier but physically they don’t change.

“They’ve done all their strength and conditioning now and their canters are starting to build up so you want them to be looking like three-year-olds now.”