The Galileo colt is a short-priced favourite for the final Classic of the season after winning the Queen’s Vase at Royal Ascot and the Group One Grand Prix de Paris earlier this term.
While he was beaten just under two lengths when third in the Great Voltigeur at York last time, O’Brien felt Kew Gardens’ 5lb penalty for his ParisLongchamp win proved crucial and anticipates renewed form when switching back up to 14 furlongs on Town Moor.
He said: “I was delighted with Kew Gardens’ run (at York).
“It was not ideal having a penalty, but we felt we had to have a run and we thought that was the perfect place to give him a prep.
“Ryan Moore was delighted with him and obviously he stays further. We always thought Doncaster would suit and hopefully the ground will be nice there.”