Forster has been searching far and wide for a suitable replacement for Marshall on Eelloh, who is named after the Electric Light Orchestra band and cost $20,000 at the Magic Millions March Sales.
Eelloh gave Forster her first $101 winner when successful at the Sunshine Coast on Anzac Day.
Forster then spelled the filly before returning after a short break to finish fifth to Kelly Schweida’s promising filly Fleet Dove over 1200 metres on a heavy Doomben track in late July.
Eelloh then turned the tables on Fleet Dove with a decisive victory over 1350 metres at Doomben two weeks ago.
“She’s a very nice filly and at this stage she’s taking the path to the Magic Millions,” Forster said.
“She’s stepping up to 1600 metres and this looks a nice race for her.
“I’m not quite sure how far she’ll get but she’s by Better Than Ready so anything is possible.”
Marshall was also due to ride Forster’s only one other runner at the meeting, Cabalo Escuro in the Fillies & Mares Class Three Plate (1200m).
Cabalo Escuro has won three of her 12 starts and is coming off a last start third to the Danny Bougoure-trained Ginger Rock at Doomben on August 12.
“Unfortunately, she’s drawn badly which will make her task a lot harder,” Forster said.