Mitchell Moses appeared to be ahead of Sam Walker at halfback during Australia's Sunday training, with Cameron Munster at five-eighth and Harry Grant at hooker.
The session offered clues about Kevin Walters' selection for Thursday night's World Cup opener against New Zealand, where Reece Walsh is reportedly in contention to start at fullback over James Tedesco.
Code Sports reported that Walsh began training with the first-choice spine, putting him in front in the fullback contest.
Walsh has not played for two months after suffering a syndesmosis ankle injury in Round 24.
The article's author argued Tedesco deserved the first chance at No. 1, citing his status as the Roosters' grand final-winning captain and Clive Churchill Medallist.
Later in the session, Tedesco joined Walker, Tom Dearden and Blayke Brailey as substitutes.