Shattered Australia fast bowler Jason Gillespie is in doubt for the rest of the World Cup.

Ravaged by injuries throughout his career, Gillespie has had scans to determine whether his right Achilles tendon injury would force him out of the tournament.

"It certainly hasn't improved since the problem initially occurred, which isn't ideal," said coach John Buchanan.

Gillespie's fate will be known within 48 hours.

He initially felt pain at a net session before last week's match against Namibia at Potchefstroom. He re-aggravated the problem at training before last Sunday's clash with England.

He missed both those matches and Buchanan rated him "extremely doubtful" for Australia's first Super Sixes game at Centurion's SuperSport park on Friday.

Physiotherapist Errol Alcott has been briefing selectors on Gillespie's worrying condition in case a replacement fast bowler needs to be brought into a squad already missing first-choice spinner Shane Warne.

"The selectors are probably on the case there," said Buchanan.

"I know Errol's been talking to them. They'll be looking at all the options at this stage but this final scan will be the determining factor."

Before the World Cup, a fully fit Gillespie had said: "I can't forsee myself having a problem ... you always get emotionally affected when you get hurt.

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