Light rain fell steadily in Sydney's eastern suburbs on Thursday afternoon with more expected on Friday which would tip Randwick into the heavy range.

But even if he is forced to withdraw triple Group 1 winner Boban, Waller has another five horses primed to give him a fourth win in the race which kick-started his Group 1 career when Triple Honour triumphed six years ago.

Boban, the one-time Doncaster favourite, is out to $16 after his seventh in the George Ryder Stakes on a slow track, his third attempt on a rain-affected surface.

"That was conclusive," Waller said.

"He didn't handle it and I doubt he would run on a heavy track.

"We would wait another week to the Queen Elizabeth."

Waller is upbeat about his other runners, with bookmakers firming French import Weary to second favourite after his win in last week's Prelude.

"Weary has a sense of timing about him and he won the Prelude in the wet," he said.

Messene has eased to $4 to give the Hawkes family training partnership its second major win in consecutive weeks following the Golden Slipper win of Mossfun.

Weary is at $6.50 and his stablemate Hawkspur is $10 after drawing barrier eight.

The 2013 Queensland Derby winner was a solid fourth in the Ranvet Stakes (2000m) behind Silent Achiever.

"The Ranvet is a good seasoning race for a race like the Doncaster," Waller said.

"He has handled the wet before, he has won over the Randwick mile before and he has not drawn too badly."

Last year's Doncaster winner, Sacred Falls, is at $13, with 2013 ATC Oaks winner Royal Descent at $15.

"Sacred Falls has been set for the race as has Royal Descent. She goes into the race third-up, which is the same as when she was a close second in the George Main in the spring."

My Kingdom Of Fife rounds out the stable's runners as the 2011 Queen Elizabeth Stakes winner continues his comeback from a long injury lay-off. AAP