I Am A Star has not raced since last spring, with a combination of issues forcing trainer Shane Nichols to abort the 2016 Group One Myer Classic winner's autumn preparation.
Nichols said I Am A Star had an active splint, some back pain, feet issues and some activity in a high suspensory but said the mare was over those issues after a good break.
“I'm really happy,” Nichols said.
“She's a completely different horse to what she was when I was prepping her up in the autumn.”
“That has topped her off beautifully,” Nichols said.
“She had a nice blow and she'll be A1 for Saturday.
“When he (Zahra) got a bit of room she went up to them nicely under her own steam.
“It's not a target race on Saturday but I want her to have done enough work so she's fit enough to go well and improve from the run, without the run hurting her.”
Nichols believes I Am A Star is forward enough to run well, but said her handicap would be telling for her first-up chances.
He believes I Am A Star will be peaking after a couple of runs back with the Group Two Stocks Stakes, which she won last year, again a target.
The Toorak Handicap and Myer Classic are Group One race options later in spring.
Godolphin import Home Of The Brave is one of the headline nominations, having impressed in two Sydney barrier trials ahead of his Australian debut.
Home Of The Brave and the Darren Weir-trained Voodoo Lad are the highest rated horses among the entries which have been extended until Tuesday.