Uncapped right arm fast bowler Chamika Karunaratne is set to replace injured Lahiru Kumara in the Test squad as the visitors strive to level the series in Canberra.
Australia hammered Sri Lanka by an innings and 40 runs in the day-night encounter in Brisbane.
That was a major boost for the Australian team, who recently lost a Test series to India for the first time on home soil.
But Sri Lanka, who recently lost a series 3-0 against New Zealand, now face a threat of another whitewash.
In another injury blow, Sri Lanka Cricket said Dushmantha Chameera – who injured his left ankle while bowling during the first Test – had been ruled out of the final Test at Canberra.