Warne will appear before an ACB Anti-Doping Committee hearing as soon as possible.
BBC: Warne out after failed drugs test
However there are grounds for the ban to be reduced pending evidence from the ACB's anti-doping medical adviser.
According to ACB guidelines, Warne faces a mandatory two-year ban from the game if the B sample, which will be tested in the next few weeks, also proves positive.
The ACB said the positive test had been triggered by fluid reduction medication, which Warne claimed was not performance-enhancing.
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