The "will he or won't he be fit" query over Harry Kewell ahead of the World Cup finals deepened today, Australia's coach Guus Hiddink admitting his concern for the Liverpool striker.
Kewell tore a groin muscle during the FA Cup final victory over West Ham last week, ruling him out of Australia's friendly against Greece in Melbourne.
He has remained at Liverpool for treatment on the injury with Australian and club medical staff, and will link up with the Socceroos at their training camp in Holland starting on May 27.
But Hiddink said he was worried about Kewell's fitness, and also that he was missing valuable tactical and strategic lead-up work the team would undertake during the next few days in Melbourne.
"I'm a little bit concerned about how his development will be," Hiddink said.
"He can be fit just before the starting game (against Japan).
"But also what we are doing here is not only building up the physical condition, but working on the tactics, the strategies towards the opening game.
"When a player is not available it has a limitation, but overall I hope he will recover." 
Follow up:
With medical staff tipping a three-week recovery for Kewell, he is likely to be line-ball to play in the Socceroos' second lead-up friendly against Holland in Rotterdam on June 4.
Hiddink hinted that match was likely to be the crucial test-bed for the Socceroos' strategies ahead of the their vital World Cup opener against Japan in Kaiserslautern on June 12.
It is generally accepted the Socceroos must beat Japan to have any hope of qualifying for the competition's second stage.
Australia's other injury concern – midfielder Tim Cahill – won't play against Greece but is in Melbourne with the rest of the squad to bone up on strategy while recovering from a knee ligament problem.
Hiddink said Cahill would train solo, with a view to introducing him into full squad training by the time the Socceroos get to Holland.
The Socceroos didn't train today, instead having a team meeting and medical tests ahead of the full squad training tomorrow.
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