Jim Cassidy could ride his 100th Group One winner as early as Saturday with trainer Chris Waller considering the George Main Stakes for progressive stayer Hawkspur.

Cassidy brought up No.99 aboard the Waller-trained Zoustar in Saturday's $1 million Golden Rose.

He is on the verge of joining elite company with only George Moore (119) and Roy Higgins (106) in the 100 club.

Waller will decide during the week whether Hawkspur runs in the George Main (1600m) or steps up to the 2000m of the Group Two Hill Stakes.

"I will have three definite runners - Shoot Out, Sacred Falls and Royal Descent and maybe Hawkspur as well," Waller said.

"We need to decide whether the Hill Stakes is the better distance."

Tommy Berry will be reunited with his Doncaster winning mount Sacred Falls, Nash Rawiller rides Australian Oaks winner Royal Descent while Hugh Bowman is on Shoot Out, winner of the race a year ago.

Cassidy has already nominated Hawkspur as the horse to take him to the big races during the spring.

The winner of the Queensland Derby in June, Hawkspur won the Group Two Chelmsford Stakes (1600m) at his most recent start.

"It will be a dream to get the 100," Cassidy said.

"Hopefully it's Hawkspur in the George Main. If not, it won't be long until I get there."

At 51, Cassidy says his body is not as willing as it once was and he has to work hard away from the track to keep fit.

"While I've got trainers like Chris Waller and Gai Waterhouse and their owners who want me, I'll keep doing it," he said.

"I have a lot of support from my family and I've got a horse like Hawkspur to take me through the spring."

Waller credits Cassidy as a big part in the rise of Hawkspur who put together three wins during the Queensland winter carnival culminating in the Derby.

"The horse got a lot of confidence from his Queensland campaign and Jimmy was a big part of that," he said.

Cassidy won the 1983 Melbourne Cup on Kiwi and steered Might And Power to win in 1997.