Australia assistant coach Stephen Larkham has revealed that the squad will split into two groups to prepare for their first two Pool A fixtures.
The Wallabies begin their World Cup campaign against Fiji in Cardiff on September 23, before taking on Uruguay in Birmingham just four days later.
With tougher tests against England and Wales to come, Larkham has confirmed that Australia are likely to start with completely different sides for the opening two matches.
"Once we get over there it is 10 days before the first game and we are splitting into two teams basically," he told the Sydney Daily Telegraph. "We will have one team getting prepped for Fiji while the other team is prepping for Uruguay.
"One team will, for example, have a captain's run on the Tuesday and the other team, that will be their Monday session. It is a tricky week once we get over there so this week in the US will be our last chance to train together until Uruguay."
Australia have won four of their five Test matches in 2015.
