Mitchell Starc has joined James Pattinson and young fast bowler Pat Cummins on the list of injured fast bowlers for Australia.
Starc returned home earlier this month due to a 'stress fracture' in his lower back.
Cricket Australia's worries were officially increased by a medical report of the fast bowler.
In a statement, on behalf of the CA, chief medical officer Justin Paolini today said: "Mitch Starc had scans following his arrival back to Australia and they have shown an early stage low back stress fracture," said in a statement."
He further added that Starc could be out for a 'prolonged period'.
"His management plan will be determined in the coming days but he is expected to be unavailable for a prolonged period."
Despite the blow to CA, there was a good news too. Paceman Jackson Bird, who flew back home from England due to the same issue as that of Starc, isn't as seriously injured as first thought.
Bird is expected to be fit by November when the Ashes again take place in Australia.
Starc hasn't been completely ruled out of the Ashes, but initial reports show he could be out for some time. He's could be fit to take part in the third test match of the series.
Fellow fast bowler James Pattinson was diagnosed with a stress fracture in his back after the second Test at Lord's in July, while Cummins is expected to miss most of the 2013-14 domestic season with recurring back trouble.
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