Australia's three International Olympic Committee (IOC) members are expected to split their support when voting for the host city of the 2012 Games in Singapore Wednesday night.
Kevan Gosper, John Coates and Phil Coles will be part of the 115- strong electorate that will decide among Paris, London, New York, Madrid and Moscow in what is believed to be the most hotly contested Olympic bid campaign in history.
None of the three would reveal their preferences, but Gosper said they would not vote as a block, according to Tuesday's The Australian, one of the leading newspapers of the country.
Gosper said Commonwealth's block vote that helped Sydney defeat Beijing for the 2000 Games no longer existed, and London could not rely on that support.
"In our own region, I sense there are varying views," he was quoted as saying Monday.
"I don't think Phil and John and I are voting the same way. I think a lot of the Commonwealth countries from the Caribbean may support New York, and it's hard to pick where the African countries may go," he said.
He revealed he had chosen his top three cities, but said the order could change based on events in the final two days, and the presentations to the IOC Wednesday morning.
Gosper said any mistakes at this late stage of the contest could cost a city dearly, as many IOC members had yet to make their final choices.