Nathan Berry has missed out on a rare opportunity in a Group One race with Glyn Schofield to replace him on leading contender Stout Hearted in Saturday's Metropolitan at Randwick.

Trainer Chris Waller said the jockey switch was not a reflection of the young rider's ability but a judgment call based on the quirks of the horse.

Berry has been aboard for three of the imported Stout Hearted's four Australian wins while Schofield was aboard when he won last month's Group Three Kingston Town Stakes.

"Nathan has gracefully stepped aside," Waller said.

"We just decided we needed an old head on him. He's a tricky horse.

"Nathan will get his chance to ride Group One winners. He's a great young rider and will have many more opportunities."

Nathan's twin brother Tommy claimed his first Group One win when he steered Epaulette to a narrow victory over Albrecht in the Golden Rose.

Schofield will ride Stout Hearted at 52kg with weights to remain the same with the expected presence of Efficient in the field at 58kg.

"I've ridden at that weight in the past couple of years so it shouldn't be a problem," Schofield said.

Stout Hearted and his stablemate Permit, to be ridden by Corey Brown, are on the third line of betting for the Metropolitan (2400m) at $9 behind Lamasery ($4.20) and Glencadam Gold ($4.80).

Waller said Colin Stephen Quality winner Kelinni would miss the Metropolitan in favour of an attempt to get into the Melbourne Cup.

Kelinni was penalised 1kg for his Group Three win on Saturday, taking him to 51kg for the Caulfield and Melbourne Cups.

"He could run well in the Metropolitan but then be a spent force," Waller said.

"I need to work out the race to target to get him into the Melbourne Cup.

"Maybe a race like the City Tattersall's Cup in two weeks would suit."

The Listed 2400m race on October 20 is also a likely target for last year's Metropolitan winner The Verminator unless there is significant rain in Sydney over the next few days.