Aidan O'Brien has finalised his jockey bookings for Saturday's Investec Derby with Ryan Moore picking up the mount on Geoffrey Chaucer.

Coolmore confirmed to that Moore would be riding Geoffrey Chaucer, who finished a promising third on his comeback in the Derrinstown Derby Trial and has been well-backed in recent weeks.

As expected, Joseph O'Brien maintains his partnership with the favourite Australia, while Seamie Heffernan is aboard the Chester Vase winner Orchestra and Colm O'Donoghue is on Dee Stakes winner Kingfisher.

Michael Stoute's Snow Sky has suffered a scare ahead of Saturday's race after banging a joint in his box overnight.

The Khalid Abdullah-owned colt booked his place in the Epsom line-up with a win in the Lingfield Derby Trial, after which connections decided to let him take his chance in the blue riband.

After a smooth preparation, Abdullah's racing manager Teddy Grimthorpe issued a statement reporting that the colt's participation is now under threat.

He said: "Michael Stoute has reported that the above colt (Snow Sky) banged a joint overnight. He will be kept monitored over the next 24 hours and a decision on his participation in the Investec Derby will be made thereafter."