Trainer Chris Waller says champion racemare Winx will most likely be switched to Melbourne to continue her Cox Plate campaign.

Waller announced on Wednesday he has pencilled in the Group One Turnbull Stakes at Flemington on October 7 as the next start for Winx.

On track for a third successive Cox Plate victory, Winx stretched her winning sequence to 20 in claiming the George Main Stakes at Randwick last Saturday.

Credit: AAP