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Ashes: Australia captain Michael Clarke can't guarantee he will be fit for first Test

Michael Clarke: Is a doubt for the first Ashes Test

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Australia captain Michael Clarke has admitted there are no guarantees that he will be fit in time for the first Ashes Test against England in November.

A long-standing back injury means Clarke has been ruled out of Australia's tour of India, where they will play the hosts in one Twenty20 and seven one-day internationals.

The 32-year-old has been suffering with the problem for some time and it limited his participation in warm-up and limited overs matches while on tour in England this summer.

And Clarke knows he has a way to go before he can be considered as a certainty for the first Test at the Gabba which begins on November 21.

"I'll say definitely not (a chance of missing), but at this stage, we can't predict how long it's going to take to get right," he said.

"If you ask Alex (Australia physio Alex Kountouris), I'm sure he'll say there is that chance.

Clarke could miss the first Ashes Test

"For me personally, I'm trying not to look at that. It's about being nice and positive and working my backside off and getting myself right."

Time

The timing of the limited-overs series in India has been questioned, with the final game of the tour to be played just 19 days before the first Test.

England, who hold the Ashes after their 3-0 series win earlier this year, arrive in Australia on October 25, but Clarke said there was no advantage for the tourists arriving ahead of the hosts.

"Every player's different. For me personally, the way to prepare for any series is to score runs in whatever form - it makes no difference," Clarke said.

"If I'm playing one-day cricket leading up to a Test series, it doesn't really make that much difference for me.

"My preparation is pretty similar. I bat in a similar way in one-day cricket as I do in Test cricket. We'll have time."

Meanwhile fast-bowler James Pattinson, sidelined by a back stress fracture, has ruled himself out of the first two Tests, but believes he could be back for the third in Perth in mid-December.

"I won't be back for the first Test, don't think I'll be right for the second," he said.

"But all things going well I could push for that WACA Test. If it's a bit green we could play four quicks up there, but I'll know more when I start bowling."

Watch England's bid to retain the Ashes in Australia live on Sky Sports