The past year has been one to remember for trainer Paul Messara thanks to the performances of globetrotting sprinter Ortensia.

But with the multiple Group One winner missing from the races for the next few months, Messara is looking to his team of up-and-coming horses to start making their mark on the racetrack including Havana who will make his debut in Saturday's Breeders' Plate at Randwick.

"I've got some really nice up and coming horses coming through, and you are always looking for your next good horse," Messara said.

"It's fantastic to have a horse as great as Ortensia and be entrusted by the owners to look after her, but we've got to have a bit of a succession plan and hopefully a few of these young horses can step up."

Ortensia is due back in Australia later this week to undergo her final leg of quarantine. She comes home with Group One victories on three different continents (Australia, Asia, Europe).

All going to plan, the seven-year-old mare will be back racing in early 2013 chasing more big race success on the back of her career-defining overseas campaign.

"She comes back (from England) on the third of October and she'll then be targeted at the Lightning Stakes at Flemington," Messara said.

"I think straight tracks are her go."

Messara, who prepares his team at the purpose built training centre which complements the breeding operation at his father John's Arrowfield Stud, won the final race at Rosehill on Saturday with the resuming stakeswinner Mahisara.

The first of Messara's juveniles to race, Havana won his heat at the official two-year-old trials last Monday at Warwick Farm.

"He's a very talented young horse but he's going to be a lot better in six months time," Messara said.

"He's definitely a big up-and-comer. A real athlete."

The Breeders' Plate for colts and geldings and the Gimcrack Stakes for fillies over 1000m on the Epsom Handicap day program signal the start of juvenile racing in Sydney for the season.