Aidan O’Brien believes the best is still to come from last season’s Coventry Stakes winner River Tiber.

He suffered a scare in the days leading up to him finishing third to Vandeek in the Prix Morny at Deauville and then filled the same position behind the same horse in the Middle Park.

O’Brien felt he was not at his best in either race, though, and he was also a late withdrawal at the Breeders’ Cup, when he was meant to take on his stablemate Unquestionable in the Juvenile Turf, who ran out the winner.

“River Tiber always worked very good. He wasn’t right in Deauville or in the Middle Park, he wasn’t 100 per cent, so there’s a good chance there’s more to come from him. I think he’s a miler, he’s fast, I couldn’t see him getting much further,” said O’Brien.

“Unquestionable could go to the French Guineas, he’s done very well. He’ll go to Naas on Sunday (after racing) and he could go for a trial in France before going back for the Guineas – and he could be a French Derby horse, he’s not as quick as the others, so he could get a bit further.

“When we went to America with them last year, River Tiber was five lengths better than the winner. He’s not rated that way, but if you put the two of them together, that is what will happen.”

Another promising colt for the season ahead is the unbeaten Henry Longfellow, who could also have the French Classics on his agenda.

“Henry Longfellow could stretch out but he looks like a miler the way he’s going, so how much further he’d get, I’m not sure,” added O’Brien.

“He could be a French Derby horse, as could Diego Velazquez, he might be more that than a Guineas horse, but he’ll go with them (to Naas) as well, so it will be interesting.”

One going further afield is Henry Adams, who is heading to Dubai.

“Henry Adams is lovely and has done very well and he is down to go to Dubai to run in the UAE Derby on the dirt. He’s a No Nay Never so will be interesting on the dirt,” said O’Brien.

As for his Derby team, as usual there are several who at this stage would appear to have all the right credentials.

Leopardstown winner Ocean Of Dreams, from the family of the great Urban Sea, is certainly bred for the job.

“Ocean Of Dreams is getting ready for the Ballysax. He worked yesterday and worked lovely but he’s a bit of a baby because he’s only had one run, so he needs to get out,” continued O’Brien.

“He looks a lovely horse, he won very easily. He has a very good pedigree, he goes back to Urban Sea, I think he’s a Derby trial horse, no doubt about that.

“Los Angeles is a big, strong, powerful horse. He always worked much quicker than he should have been from the day we started working him, he showed loads. He’s very big and shouldn’t have shown as much as he was, but he always did.

“Then he ran in Tipperary and won in Saint-Cloud and Christophe (Soumillon) was impressed the day he rode him. He’ll go for a Derby trial and we’ll see what will happen. He’ll probably go to Naas on Sunday as well. He could be a Curragh (Irish Derby) horse.

“Grosvenor Square could be a very interesting horse. I think he’d have no problem with better ground. He’s not a heavy-framed horse, he’s a good mover. He’ll go for a Derby trial.”

As for the fillies, O’Brien was dealt a blow when news broke recently that Opera Singer, undoubtedly the best prospect in the division, was likely to miss Newmarket, but there are other options.

“Content was impressive last year, she had a lovely run first time but then went to Ascot and lost her way, we had to slow her down and get her to relax,” said O’Brien.

“She won at the Curragh and came home very well (fourth) in the Breeders’ Cup. She could be a very nice filly, you just have to take your time with her, as she has plenty of speed.

“I like Ylang Ylang a lot. She did very well to do what she did because everything went wrong with her the third day, she was too keen. She had to come back to Newmarket and relax but then to go back and do what she did in the Fillies’ Mile, you’d have to like her a lot.

“She could get a mile and a half, she’s out of a Shamardal mare, so there’s every chance she could and the way she likes to be ridden will help her.

“I don’t think if Opera Singer was going to make the Guineas it would have been a difficult choice for Ryan (Moore) though, she (Opera Singer) is very good. What she did in the Boussac…she’s another Justify, set her off in front and follow me if you want.

“The other filly is very good but you have to take your time with her. That’s what makes the Justifys so good, they are so uncomplicated.

“Opera Singer is cantering but missed a few weeks, so I imagine the Irish Guineas would be the earliest, we’d just have to rush her too much otherwise. The year is long.”

Aidan O’Brien admitted his disappointment after River Tiber was ruled out of the Breeders’ Cup Juvenile Turf at Santa Anita.

The Wootton Bassett colt was expected to be a major player in the mile contest after claiming third in the Middle Park Stakes on his most recent run, but River Tiber was scratched on vets’ advice just hours before his intended engagement.

Stablemate Bolshoi Ballet was also taken out of Saturday’s Breeders’ Cup Turf and O’Brien was pragmatic in his response.

He told ITV Racing: “He (River Tiber) was being checked all week, he seemed OK and the vets have checked him this morning and weren’t happy with him, so that’s the way it is. Obviously that’s the rules and I suppose there’s no more to say about that.

“We’re visitors here and we’re very grateful to be here, rules are rules and they just weren’t happy with him today.

“Obviously they’re athletes and they don’t pull out the same way every day, like we don’t get out of bed every day the same, and he might have been slightly stiffer today than he was yesterday.

“When you’re training horses that does happen and every athlete in the world will tell you the same, it’s very fractional and I suppose it’s opinion. I suppose there was a different panel of vets checking them all week and just a different vet checked him this morning and he wasn’t happy, so that’s the way it was.

“Obviously when we came here we were happy to abide by whatever rules were going to be set in this state by the Breeders’ Cup.

“We’re disappointed for the lads (owners) really, they put a lot in but that’s that way it is.

“Whatever decision the authorities make in any sport, you just have to stand by it, you don’t always agree with it but somebody has to make the decision, sometimes it will fall for you, sometimes it won’t. With these horses today, it didn’t fall for us.”

Of River Tiber’s future plans, he added: “I’d say he’ll have a break – this obviously would have been his last run and he will be trained for the Classics next year.”

The Ballydoyle handler still won the Juvenile Turf, with Unquestionable taking the prize under Ryan Moore.

O’Brien’s runners were not the only horses scratched, with the Jessica Harrington-trained Givemethebeatboys taken out of the Juvenile Turf Sprint.

The handler admitted the experience could make her think twice about bringing horses to the fixture in the future.

She said: “He has not had a single issue all week – he has been examined at least three times a day, he has been out on the track, he has galloped, he’s done stalls, there are vets on the gallops.

“He went out this morning as usual, did a little trot to come back in and the vets came to have a look at him and they decided he was not entirely level on his off fore.

“I don’t agree with them – I see where they trot our horses up is not a level place, you trot on some mats and then you’re on sand.

“It would definitely (deter me from bringing horses back). I brought out what I thought was a very sound horse, I know they have to be careful but being careful or over the top are two different things.”

Aidan O’Brien has stated his intention to run River Tiber in the Prix Morny on Sunday – but warned the exciting colt suffered a setback in the lead-up to the race.

Last seen winning the Coventry Stakes at Royal Ascot, his third win from three outings, he is currently favourite for the Deauville Group One.

However, he missed a piece of work two weeks ago and O’Brien said it will be difficult to know how much fitness he lost as a result.

“The plan is to run River Tiber. He had a setback a couple of weeks ago so there will be a cloud over him when we do run him as we’re a bit worried about his fitness, but the plan at the moment is to run,” O’Brien told Sky Sports Racing.

“He had a hold-up and missed his second-last piece of work so he had that week off, but he did a piece of work this week so that gave him a chance to go.

“He seems to be in good form since, but the ground that we lost you couldn’t make back up with him.”

O’Brien also provided news of another of his stable stars who has been sidelined, last year’s Gold Cup winner Kyprios.

“Kyprios was at the Curragh for a canter last weekend after racing and that went well. He seems to have come out of that well,” said O’Brien.

“We’re looking at maybe starting at the (Irish) Leger, but that’s a tough enough race to come back in so we’d be hoping he could run a good race, come out of it OK and then have a look at something on Arc weekend, something like that, because you couldn’t expect him to perform at his best after such a traumatic year. If it all went well we could look at next year with him.”

River Tiber gave Aidan O’Brien a record-extending 10th victory in a thrilling Coventry Stakes.

Ryan Moore, odds-on to become top jockey at the Royal meeting, got on the board early and there was no hanging about in the six-furlong dash.

Despite having won his first two starts over shorter trips, punters placed their faith in the Coolmore team, sending the son of Wootton Bassett off the 11-8 favourite for the juvenile Group Two.

He travelled well throughout the race, tracking Frankie Dettori aboard Givemethebeatboys, yet Moore had to get serious two furlongs from home to roust his mount to go past.

With that battle won, the strapping winner had to fend off Army Ethos (20-1), who flew under Hollie Doyle in the final 100 yards, with Bucanero Fuerte and Kevin Stott following him through to be a close-up third. Givemethebeatboys, sold for £1.1 million at the Goffs London Sale on Monday evening, faded into fourth.

O’Brien was registering his 82nd winner at the Royal meeting, equalling Sir Michael Stoute as the most successful trainer at the fixture.

River Tiber preserved his unbeaten record and booked his ticket to Royal Ascot with a convincing win at Naas.

Aidan O’Brien’s son of Wootton Bassett was sent off the 2-9 favourite for the Coolmore Stud Calyx Race on the back of an impressive 10-length demolition job at Navan on debut – and although momentarily under pressure when Ryan Moore asked his mount to quicken, River Tiber soon exerted his dominance to win going away by two and a half lengths.

O’Brien was delighted with the performance, believing the outing will provide the perfect education ahead of his trip to Ascot next month, and River Tiber heads the market for the Coventry Stakes at the big meeting with Coral going 3-1 and both Paddy Power and Betfair a shade shorter at 11-4.

“I was very happy and very happy that we ran him. He hadn’t been asked to do anything off the bridle at home, then he went to Navan and won very easily in soft ground so he probably doesn’t know a lot,” said O’Brien.

“It was good strong pace today on good ground and before Ascot it’s very important that they do that.

“Ryan had to catch a hold of him and make him get down and stretch, he would have learned an awful lot and he was very happy with him. We were delighted.

“I thought that he might not even come off the bridle as he shows loads at home. Ger’s (Lyons) horse (Tourist, second) is obviously a good horse, he took him off the bridle.

“Ger’s was second to one of ours (Johannes Brahms) here the last day and we liked him as well.

“He’s a horse to look forward to. We thought he would be a Coventry horse.

“We have three Wootton Bassetts, it’s the first time we’ve had them, and two of the colts are very good. It’s unusual that two colts were good out of the three.

“He’s always shown loads, but very much always on the bridle doing his work and before you go to Ascot you have to take them off it and teach them. Hopefully that’s the job done for him now.”

When asked about the quick ground for the winner he added: “Ryan said he had no problem with it.

“Everyone said that the Wootton Basssetts handle soft ground very well so I wasn’t sure about it, but Ryan was very adamant that it was no problem.

“It’s good ground there and you won’t get much quicker at Ascot.”

There was a first winner for Michael Halford and Tracey Collins since joining forces when Cosmic Vega (14-1) knuckled down gamely in the closing stages to hold off Johnny Murtagh’s Sharlouk in the Listed Owenstown Stud Stakes.

“He was all heart and he got a brilliant ride, Ronan is riding out of his skin,” said Halford.

“I’m thrilled for myself and Tracey, it’s a great start. We’ve had to be patient.

“I had to walk the track before I decided to run him or not. It was a close call, but thankfully the owners said that they’d go with my decision. For once we got it right.

“His best form is probably on a turn with a dig in the ground, so I’d be thinking about the Listed race in Killarney for him. I’m not sure about the hustle bustle of Ascot for him.

“Ronan is a very underestimated rider – I don’t think any more, though. He’s a world class jockey and just needs the opportunities as he’s proved with Skitter Skatter and a few other horses. He rode a great race for Jessie (Harrington) during the week in York (on Sounds Of Heaven).

“We’re delighted to have him, he’s a big part of our team and he’s a big team player.”

River Tiber preserved his unbeaten record and booked his ticket to Royal Ascot with a convincing win at Naas.

Aidan O’Brien’s son of Wootton Bassett was sent off the 2-9 favourite for the Coolmore Stud Calyx Race on the back of an impressive 10-length demolition job at Navan on debut – and although momentarily under pressure when Ryan Moore asked his mount to quicken, River Tiber soon exerted his dominance to win going away by two and a half lengths.

O’Brien was delighted with the performance, believing the outing will provide the perfect education ahead of his trip to Ascot next month, and River Tiber heads the market for the Coventry Stakes at the big meeting with Coral going 3-1 and both Paddy Power and Betfair a shade shorter at 11-4.

“I was very happy and very happy that we ran him. He hadn’t been asked to do anything off the bridle at home, then he went to Navan and won very easily in soft ground so he probably doesn’t know a lot,” said O’Brien.

“It was good strong pace today on good ground and before Ascot it’s very important that they do that.

“Ryan had to catch a hold of him and make him get down and stretch, he would have learned an awful lot and he was very happy with him. We were delighted.

“I thought that he might not even come off the bridle as he shows loads at home. Ger’s (Lyons) horse (Tourist, second) is obviously a good horse, he took him off the bridle.

“Ger’s was second to one of ours (Johannes Brahms) here the last day and we liked him as well.

“He’s a horse to look forward to. We thought he would be a Coventry horse.

“We have three Wootton Bassetts, it’s the first time we’ve had them, and two of the colts are very good. It’s unusual that two colts were good out of the three.

“He’s always shown loads, but very much always on the bridle doing his work and before you go to Ascot you have to take them off it and teach them. Hopefully that’s the job done for him now.”

When asked about the quick ground for the winner he added: “Ryan said he had no problem with it.

“Everyone said that the Wootton Basssetts handle soft ground very well so I wasn’t sure about it, but Ryan was very adamant that it was no problem.

“It’s good ground there and you won’t get much quicker at Ascot.”