Mile Jedinak has sent a scare through the Socceroos camp after limping off in Crystal Palace's final English Premier League game of the season.
Jedinak, who is set to be named Socceroos skipper when Ange Postecoglou names his preliminary 30-man squad on Wednesday, picked up a groin injury in Palace's 2-2 draw with Fulham.
The 29-year-old's World Cup preparations have been thrown into turmoil after he suffered a groin injury, and was forced off just 14 minutes into the second half.
He will undergo scans this week to determine the extent of the injury but initial thoughts are he will be sidelined for at least two weeks.
It's understood Jedinak will not be able to train or play before the squad reaches Brazil, raising questions whether he should remain in the UK for treatment and meet the squad in Brazil rather than make the long-haul flight to Australia.
The ill-timed injury brought to an end an impressive record from the Australian midfielder, preventing Jedinak from playing in every single minute of the EPL season.
The former Central Coast Mariners star has been a revelation in the Premier League and topped the competition in making the most tackles and interceptions this season.
Jedinak is a certainty to be named in Postecoglou's squad this week and is expected to be skipper, having fulfilled the role in March's friendly with Ecuador.
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