Aidan O'Brien warns Derby second favourite's Epsom challenge 'not written in stone'

Constitution River's Epsom Derby participation remains uncertain after his Chester win, while Aidan O'Brien confirmed Benvenuto Cellini and Pierre Bonnard as definite Derby hopefuls during Monday's Ballydoyle media morning

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May 11, 2026 - 16:49
Aidan O'Brien warns Derby second favourite's Epsom challenge 'not written in stone'
Constitution River's Epsom Derby participation remains uncertain after his Chester win, while Aidan O'Brien confirmed Benvenuto Cellini and Pierre Bonnard as definite Derby hopefuls during Monday's Ballydoyle media morning
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