Frankie Dettori has switched rides and will now ride Arrest in the Gr1 Betfred St Leger (16h35) at Doncaster on Saturday.
He was originally carded to ride stable-mate Gregory, but due to the change in ground conditions he now rides the Juddmonte colt.
A total of 21 millimetres of rain fell on Town Moor on Tuesday, meaning track conditions were soft on the opening day of the festival on Thursday.
More light showers fell on Thursday afternoon which must have swayed Dettori to ride Arrest, who beat Adelaide River by six and a half lengths on very soft ground in the Chester Vase back in May.
Owners Juddmonte are delighted Dettori has sided with their colt.
Racing manager Barry Mahon said: “John called this morning to say that Frankie had thought about it, and with the rain he was happy to ride Arrest.”
Gregory lost his unbeaten record last time out when dropping down to a mile and a half in the Great Voltigeur at York behind the re-opposing Continuous and will now be ridden by Kieran Shoemark.
The Gosden’s also saddle the supplemented Middle Earth, with Oisin Murphy in the irons, a hugely impressive winner of the Melrose at York’s Ebor meeting.
The King and Queen, rumoured to be on course on Saturday, have a real chance of success with the William Haggas-trained Desert Hero, a Royal Ascot winner, in the King George V Stakes.
He subsequently won the Gordon Stakes at Goodwood, narrowly beating the re-opposing Simon and Ed Crisford’s Chesspiece.
Aidan O’Brien runs four, Great Voltigeur winner Continuous, Alexandroupolis, Denmark and Tower Of London, with Continuous looking the stable pick with Ryan Moore aboard.
A competitive field of nine jump away from the mile and three-quarter start on soft ground in what looks to be a tactical affair. The Gosden trio all look progressive, and Frankie had the choice. He is selected to come out on top on the Frankel colt who loves soft ground and win his 7th Leger.
Earlier on the card 14h50, the exciting juvenile Rosallion takes on only four rivals in the Gr2 Betfred Champagne Stakes over 7-furlongs. The Richard Hannon trained runner looked very smart when slamming his rivals in the Pat Eddery at Ascot in July and should remain unbeaten.