It has almost become a spring tradition in the racing world to wait on Lloyd Williams.

At Werribee on Sunday, star international jockey Brett Prebble joined the queue of those trying to anticipate the whims of the man who holds more major-race cards than any other.

Williams could have three runners in next Saturday's Caulfield Cup, he could also have four or five.

Or he could just as easily decide to have none.

For Prebble, who won last year's Melbourne Cup for the leviathan owner on Green Moon, the question over the Williams representation in the Caulfield feature had a sharper edge applied to it after he worked English Cup hopeful Forgotten Voice at Werribee.

While most had come to the track to watch Caulfield Cup second favourite Dandino gallop, Prebble and Forgotten Voice provided a bonus, pushing their better-credentialled workmate all the way to the line.

"That was as good a work as you'd get," Prebble said.

"If he got a run in the Caulfield Cup, I'd ride him.

"He gave me a real good feel. I was surprised at the turn of foot he had.

"And he's a big strong boy and I couldn't pull him up, that's what I liked most about him."

Forgotten Voice, a horse who has mixed hurdling and flat racing with considerable success, is just on the wrong side of the borderline for a Caulfield Cup start and his fate, somewhat ironically, could depend on how many runners Williams pays up for on Tuesday.

For Prebble there will be no decision to make. If Williams has a horse for him, he'll ride it.

"I'm happy to ride any of Lloyd's ahead of any other horse," he said.

"Their form is stronger than any of the others. They're weighted well. There's no negatives with any of Lloyd's.

"It's whether he wants to run them."

At this stage, Williams is most likely to have three runners - Seville, Masked Marvel and Fawkner.

But he could also add Saturday's Herbert Power Handicap winner Sea Moon to the mix .

Prebble said Green Moon was a definite non-runner.

Of the likely Williams trio, Prebble suggested Fawkner could prove the pick ahead of his more-fancied stablemates following his good fourth in the Turnbull Stakes.

"His run the other day was huge. He was exposed from the 700 (metres), in front from the 300," he said.

"It was the first time he's had a decent hitout this prep."