Australia coach Robbie Deans was forced to make three changes to his 25-man training squad on Sunday after more injury problems ahead of the British and Irish Lions test series.
Melbourne Rebels halfback Nick Phipps, NSW Waratahs lock Kane Douglas and Western Force loose forward Ben McCalman were called up after second row Sitaleki Timani and in form back row Scott Higginbotham both injured.
Melbourne Rebel Higginbotham left the field with a sore shoulder during his side's Super Rugby loss to the Queensland Reds on Saturday, with Timani picking up a broken thumb as the New South Wales Waratahs lost to the Canterbury Crusaders on Friday.
Both players will go for scans to determine whether or not they will feature in the three tests against the Lions in June and July.
Reds winger Digby Ioane is still continuing rehabilitation for a cartilage issue in his left knee but will join up with the squad who begin work in Sydney on Sunday.
"Digby is unable to train. His focus is on getting his knee right, which is why we've chosen to bring him in anyway, so our medical staff can oversee the process," Wallabies coach Robbie Deans said in a statement.
McCalman was expected to lineup for the Force against the Lions in Perth on Wednesday but his first Wallabies callup in a year means he will sit out the midweek game.
Phipps is the second scrumhalf named in the squad and gets the nod ahead of Nic White of the ACT Brumbies as the deputy for first choice Will Genia.
"I guess, like every other player in the country, I'm desperate to have a crack at the Lions," Phipps said in a statement.
"It's a once in a lifetime opportunity, one that a lot of players don't get."
Deans named a preliminary squad last month and will add six more on June 11 ahead of the first test in Brisbane on June 22 but the rigours of the physical Super Rugby competition have taking its toll.
First choice openside flanker David Pocock will miss the series with George Smith, a likely replacement, struggling with a knee problem picked up last month. Hooker Tatafu Polota-Nau was left out of the squad because of a broken arm.
Media reports in Australia suggest back Kurtley Beale, who is undergoing treatment for alcohol-related problems in a Sydney clinic, will also be invited to train with the squad after a runout for his club Randwick on Saturday.
The Lions thrashed the Barbarians 59-8 in Hong Kong on Saturday and arrive in Australia on Monday to continue preparations for the test series.