Australia batsman Joe Burns has been diagnosed with a post-infectious fatigue disorder dating back to last October.
The opener played just one game for Lancashire before leaving the county and returning to his homeland for personal reasons last month.
On Tuesday Queensland revealed that the 29-year-old has been suffering from fatigue and burnout.
Queensland stated that Burns is expected to be available to return "in the near future", with the Ashes beginning at the start of August.
Max Walters, the Queensland Cricket chief executive, said: "We wish Joe the best in his recovery and look forward to helping him make a successful return as soon as possible."
Burns has played 16 Tests, scoring four hundreds and as many half-centuries.
