Rugby Australia CEO Andy Marinos said that would give the Wallabies time to rest after the bunched-up three-test series against France.
"At a worst case we're looking at August 7th as the first possible date that (the Rugby Championship) could happen," he told reporters.
"There's a good two, maybe three weeks after this (France) test series in order for the guys to recoup, refresh and get themselves ready."
World champions South Africa pulled out of last year's Rugby Championship against Australia, New Zealand and Argentina, citing player welfare concerns.
