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Australia have not lost a Test at the Gabba since 1988.

South Africa have not lost a series away from home in six years.

The unstoppable will meet the immovable today with both teams claiming they will not be distracted by the leaking of Australia's dossier on the visitors' alleged weaknesses.

As Australian captain Michael Clarke suggested that the Gabba pitch's green tinge and expected overcast conditions today could force a tactical rethink and the presence of a fourth seamer in place of spinner Nathan Lyon, his opposite number refused to be ruffled by the leaked document.

"It is not that secret any more," Graeme Smith said on the eve of his country's first Test in Brisbane in nearly half a century. "There is nothing really new and nothing we didn't expect.

"We have all played enough against Australia to know what we need to do to be victorious here and we have prepared that way."

Smith said the tourists had done their own homework on Australia but "we try to keep it in the guys' heads so it is not left lying around".

Clarke denied having any knowledge of the document or who had leaked it to a Queensland news- paper, but said it would have little relevance once play started.

"There is some information in there that is common knowledge and there is other stuff that makes for interesting reading," he said.

"We have plans for every opposition we play against but we don't, as a team, have an official dossier as such.

"We look at footage, we talk about opposition players, we study opposition strengths and weaknesses.

"There was stuff in there that is common knowledge about the South African team and other stuff that we certainly haven't spoken about."

The dossier, which appears to bear the hallmark of Australia's coach Mickey Arthur, the former South African mentor who considers this series to be his Ashes, contained few surprises, particularly with its emphasis on short-pitched bowling.

Both teams are sure to use the approach liberally with each having four bowlers capable of bettering 140km/h.

The Australians were also urged to sledge South African run machine Hashim Amla, the No.2 ranked batsman in the world who recently produced his country's highest score of 311 not out.

Clarke said the team would not be finalised until the morning, with left-armer Mitchell Starc warming as a likely replacement for Lyon.

"I was expecting to have a decision today but the wicket has changed since yesterday and we will have to wait and see if it changes any more," Clarke said.

"At this stage, we are still deciding whether to play four fast bowlers or three and Nathan."

South Africa's team is predictable but imposing with five batsmen having scored centuries in Australia and an attack that includes three of the world's top-nine ranked pacemen.

Cricket Australia is tipping the first-day crowd to break the Gabba record of 21,000 for a non-Ashes Test.