Former NSW premier Gladys Berejiklian will front the Independent Commission Against Corruption (ICAC) next week.
Ms Berejiklian resigned from her position three weeks ago when the corruption body announced a public hearing into whether her conduct "involved a breach of public trust".
The inquiry relates to her relationship with Wagga MP Darryl Maguire.
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Mr Maguire is due to front ICAC on Wednesday, before Ms Berejiklian on Thursday and Friday.
Former Nationals leader and NSW deputy premier John Barilo is scheduled to appear before the inquiry on Monday.
Yesterday, Ms Berejiklian's predecessor and close friend Mike Baird told the inquiry he was "incredulous" when her secret relationship with Daryl Maguire was exposed.