The chances for Rosehill trainer Chris Waller of back-to-back Queensland Derby wins depend on which Vilanova turns up on the day.
The gelding emulated his stablemate Hawkspur with a dominant win in Saturday's Grand Prix Stakes at Doomben to become favourite for the June 7 Derby (2400m) at Eagle Farm.
Waller concedes Vilanova mixes his form but hopes the win will give him confidence as he tries to claim the double Hawkspur achieved a year ago.
"He is frustrating. He needs things to go his way and I think he's better on a wet track. I just hope this gives him confidence and he can repeat that win."
The Grand Prix was Vilanova's third win from 22 starts and his first since he won the Autumn Classic at Moonee Valley in February.