Mitch Marsh failed again on Sunday as Australia's hopes of a fourth Test win against India took a massive hit.
Marsh, nicknamed Bison, was caught behind off Indian ace Jasprit Bumrah for a fourth-ball duck.
Other than his second-innings 47 in the first Test, Marsh has not scored more than nine.
The medium pacer also has taken just three wickets in the series and only bowled seven overs in India's first innings.
After his dismissal for four in the first innings, Marsh badly needed a decent knock on Sunday to keep the hounds at bay.
Whatever the result on Monday, he is the most vulnerable member of the Australian XI heading into next week's fifth and final Test at the SCG.
Webster was drafted into the squad as injury cover for Marsh ahead of the second Test and he was also in the mix for Melbourne.
Marsh had a sore back after the first Test and has been playing mainly as a batter since.
Webster, 31, has been a standout in the Sheffield Shield for the last 18 months.
Last summer, the Tasmanian became only the second player after West Indian great Sir Garry Sobers to score 900 runs and take 30 wickets in a Shield season.
He is yet to make his Australian debut in any format.
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