Queensland talisman Cameron Munster appears set to play fullback in the State of Origin decider after a calf injury to Kalyn Ponga.
Maroons coach Kevin Walters has remained mum about how his side will line up but a major clue was given at training on Tuesday.
After news cameras were told to stop filming, Munster – who played five-eighth in the first two matches – practised catching high balls and collected grubber kicks from trainer Allan Langer.
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The uncapped Corey Norman slotted into the halves in a further sign that Munster will shift to the custodian's role.
Michael Morgan sat out the session after copping a head knock over the weekend but is tipped to start at pivot with Norman to come from the bench.
Moses Mbye, the side's interchange utility thus far in the series, trained at left centre – the position that Morgan had occupied.
While Queensland's changes in key positions may seem like a disadvantage, former Blues coach Phil Gould admitted he's worried that Munster can make a game-changing impact at fullback.
“I’m fearful that they play Munster at fullback,” Gould told 100% Footy.
“I think that’s their best option and I think he can be extremely dangerous for them.
“I’m really fearful that Munster plays back there because he’s the sort of kid that’ll think he can win it from there.
“He’ll think he can get his hands on the ball more often. He’ll have a license to go anywhere on the field and he will feel that he can be the difference between the two sides.
“That’s dangerous. You don’t like playing against those sorts of people.”
Munster began his NRL career as a fullback and featured there in the Melbourne Storm's 2016 grand final loss to the Cronulla Sharks.
He racked up 50 appearance in the No.1 jersey – only one match less than he's made as a five-eighth at club level.
And he clearly enjoys playing fullback, declaring his desire to make the role his own for the Maroons before the NRL season began.
“A lot of people thought that Kalyn Ponga or Val (Holmes) would be the Queensland fullback next year, but if I was to be considered as well, that would be great," Munster said in December.