Heavyweight jockey Nash Rawiller has been booked for the Caulfield Cup mount on Australian Oaks winner Royal Descent in expectation weights will have to be raised for Saturday week's race.

Royal Descent has 52.5kg in the Caulfield Cup but weights are expected to increase 1.5kg in the absence of Melbourne Cup winner Green Moon.

Should Manighar also miss the race, weights will have to be lifted 3kg to ensure a 58kg topweight, which would leave Royal Descent handicapped on 55.5kg.

Waller said Rawiller's booking took into account Caulfield Cup weights going up by at least 1.5kg.

"(He will have the ride) on the basis that the weights will be raised and also on the fact that Nash has committed to ride below his regular riding weight," Waller said.

"No rider has been put on standby should the weights remain where they are."

Royal Descent ran unplaced for the first time in her spring campaign in the Turnbull Stakes last Saturday but kept her place as the Caulfield Cup second favourite at $7 behind stablemate Hawkspur.

Hawkspur will be ridden by Jim Cassidy while Craig Newitt is on standby to ride Kelinni or Moriarty.

Kelinni disappointed the stable in the Craven Plate at Randwick last Saturday, his first start since a setback following last month's Chelmsford Stakes.

"So far nothing has come to notice after his run and he'll have a really strong gallop at Rosehill on Friday," Waller told Warwick Farm stewards on Wednesday.

"We'll see how he pulls up after that."

Rawiller, who was dumped as the rider of Melbourne Cup favourite Fiorente on Sunday, teamed up with Royal Descent during an autumn campaign highlighted by the mare's 10-length romp in the Australian Oaks at Randwick.

Glen Boss was in the running for the Royal Descent mount until he was booked to ride Silent Achiever.