Champion Fillies Stakes winner Fuddle Dee Duddle will back up in Saturday's Group 2 $350,000 WA Guineas (1600m).
And owner Eddie Rigg believes Fuddle Dee Duddle's biggest career win in the $200,000 fillies feature (1600m) at Ascot on Saturday will serve her well and justify a start in the $500,000 Kingston Town Classic (1800m) on December 8.
Rigg and partners Ron Sayers and Kim Hunter celebrated a rare quinella in the Champion Fillies after $61 chance Bippo No Bungus ran second.
Connections will need to find a new rider for Fuddle Dee Duddle in the Kingston Town, with regular jockey Paul Harvey unable to make her 50kg weight under the weight-for-age conditions.
Harvey can ride the Red Ransom filly in the Group 2 Guineas, where fillies carry 54.5kg and have a 2kg advantage on colts and geldings.
"She will be kept bright and sharp during the week," Rigg said.
"She does too well in the stable and will back up well.
"It is disappointing Paul won't be able to ride her in the Classic.
"We think she will go really well in the Classic and will be searching for the best jockey. The 1800m will suit her much better."
Owner Bob Peters is likely to declare with the beaten Champion Fillies favourite Antique Belle because final acceptances for the Guineas will be closed today.
"We don't have much time to think it over," Peters said.
"I will speak to (trainer) Grant Williams in the morning."
Antique Belle, who ran home well to be beaten a length in third place, was a victim of a rough-house affair. Stewards banned apprentice Jordan Mallyon for 21 days for shifting in on Secret Scandal and causing Antique Belle to be tightened and blunder at the 1500m.
Stewards also cautioned Harvey and Antique Belle's rider William Pike.