Former Tasmanian attorney-general Elise Archer quit parliament earlier this month amid accusations of workplace bullying and a messaging saga.
A recount to replace Ms Archer, who was elected in 2010, in the Hobart-based seat of Clark will begin on Monday afternoon.
It is expected to go to fellow Liberal and current Hobart councillor Simon Behrakis, who has confirmed he will run.
Ms Archer's departure was another blow for the party, which has governed in minority since May when two MPs quit and went to the crossbench.
She was the fifth Liberal to resign since the most recent state election in 2021.
Ms Archer alleged she was threatened by Premier Jeremy Rockliff, who gave her a deadline to either resign or back his government as an independent.
Ms Archer had earlier been sacked from cabinet by Mr Rockliff over messages he deemed inappropriate, but took days to make a final call on her political future.
Ms Archer lodged a formal complaint against Mr Rockliff with the Director of Public Prosecutions but it was dismissed because there was no evidence of criminal wrongdoing.
In one leaked message Ms Archer was critical of Mr Rockliff and in another she said she was "sick" of abuse victim-survivors, something she claimed had been taken out of context.
She denied the bullying allegations and said she had not been afforded due process.
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