Constitution River’s move from a commanding Chester performance into Group 1 company in France this weekend places him firmly at the centre of Aidan O’Brien’s three-year-old picture, with Ballydoyle sending a three-pronged challenge into the Chantilly feature that will test whether the Dee Stakes form can translate at the highest level.

DEE STAKES FORM LINES

The son of Wootton Bassett arrives in France off a decisive 7-length victory in the Dee Stakes at Chester, a performance that earned him a Timeform rating of 124p and pushed him to the forefront of O’Brien’s Classic crop.

That effort was used as a key measuring point for stamina and progression, with connections using the run to confirm his ability to handle further than a mile.

O’Brien reflected on the intent behind that outing, outlining the specific objective the stable had going into Chester.

“We've decided that Constitution River will go to France. We went to Chester with him looking to find out if he stayed a mile and a quarter and he saw it out very well there,” the Ballydoyle trainer said, underlining the importance of that test as a guide to Sunday’s assignment.

The assessment was particularly significant given the nature of his performance, with the margin and manner of victory reinforcing the impression that he is still progressing.

CHANTILLY TEST AND STABLE DEPTH

Constitution River is set to be joined by stablemates Hawk Mountain and Montreal in the Chantilly feature, giving Ballydoyle a strong hand as they target the French Classic.

O’Brien was clear that the assignment represents a notable rise in grade, but indicated that the colt’s preparation has been straightforward since Chester.

“This is obviously a big step up but everything has gone very well in the build-up to the race and everybody is very happy with him,” he said, offering a measured view of the task ahead while still expressing satisfaction with the colt’s condition.

The trainer also expanded on the long-term view taken with the colt, particularly around his balance of pace and stamina.

“We've always thought he was a colt who had enough pace for a mile but would hopefully stay a mile and a quarter and he looks to be a very classy horse,” O’Brien added, a comment that signals the confidence behind his Classic placement.

With Ballydoyle represented in depth and Constitution River arriving off a peak-rated performance, the French Derby will now provide a clear examination of how far his current trajectory can carry him at Group 1 level.

The Chantilly test will ultimately define whether his Dee Stakes authority translates into Classic confirmation or remains a stepping stone in an already progressive profile.

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