David Warner, who returned to form with a double century in Australia's thumping win over South Africa in the Boxing Day Test, has said he's not done yet and has the "extra motivation" to do well in the highly-anticipated India series and the Ashes next year.

Warner, who had said that Test cricket may be the first one to "fall off" in his international career, shrugged off a prolonged lean phase to come up with a double century in their innings and 182-run win over South Africa.