A washed-out training session and a David Warner stomach bug have threatened Australia's preparations for Sunday's one-day international series-opener against England at the MCG.
Warner arrived in Melbourne on Thursday along with Steve Smith and other members of the Test squad.
The vice-captain fell ill and was absent from training on Friday, instead staying at the hotel to rest.
Team medical staff are confident Warner will be fine to play in the first of five ODIs.
Josh Hazlewood is set to be rested with uncapped West Australian quicks Jhye Richardson and Andrew Tye vying to replace him.
Pat Cummins will sit out the second ODI in Brisbane and Mitchell Starc is certain to also have a rest at some point.
The squad will have a longer than normal training session on Saturday after persistent rain denied them the chance to practice outdoors at the MCG on Friday.
Australia's ODI form has been underwhelming over the past 18 months but allrounder Marcus Stoinis said there were no concerns about the team's preparation.
"The T20 boys trained yesterday. It was only half of us but we got a good hitout," Stoinis said.
"We'll have a good hitout tomorrow. We train all year, every day, thinking about cricket and that sort of thing so hopefully missing a training session here and there isn't a big deal."
Stoinis, who was dropped for the Champion's Trophy but played well during October's tour of India, is one of several middle-order options in a side anchored by Smith, Warner and Aaron Finch.
Cameron White is all but certain to play after earning a shock recall to replace the injured Chris Lynn, while Tim Paine is set to wear the gloves after a strong Ashes series.
That leaves Stoinis, Mitch Marsh and Travis Head to compete for the two remaining spots.
Stoinis returned to WA last year to be closer to his sick father, who died of cancer in November.
The 28-year-old was delighted to see White back in the national mix after being taken under his wing in Victoria.
"He is one of the smartest players in Australian cricket, if not international cricket," Stoinis said.
"I remember six years ago pre-season, every morning he'd send me a message saying 'What are we doing this morning? Why are we doing it? What are you looking to get out of it?'
"So it's no wonder why he's so good and I'm stoked for him to have the chance to get back into the Aussie colours."