Formosa had a training double at the track on Saturday night with Si Si Senor and Jackeroo Shannon but will be a driver only on Monday.

The best on his book is the Ray Harkness-trained four-year-old Beersinmypocket, which Formosa steered to a 29-metre win in the wet at Newcastle on May 18. He will start from the second line on Monday in race three.

"It looks above average so hopefully he has a trouble-free run tomorrow and he should go close to winning again," Formosa said.

On Saturday night, Jackeroo Shannon led all the way with Formosa aboard, while Jack Callaghan gave Si Si Senor a perfect run behind the pace before he finished over the top of Regal Rock.

Formosa is training Jackeroo Shannon for Tamworth's Sarah Rushbrook while she recovers from injuries suffered in a fall in March. Si Si Senor came back from a poor last-start run when ninth.

"He's a pretty nice horse when he's right and I was confident he would run well," he said of Si Si Senor.

"He had a bug then he ran a really good race after he recovered. But I backed him up a week later and he just couldn't go."

"I've just got to space his runs out a bit now."