Former Victorian premier Denis Napthine is to quit politics after 27 years in Parliament.
It's understood he and Liberal colleague Terry Mulder will resign on Monday, triggering by-elections in their electorates.
Dr Napthine holds a 10.9 per cent margin in South-West Coast, while Mr Mulder has a 10.6 per cent margin in Polwarth.
Dr Napthine became Victorian premier in early 2013 after the surprise resignation of Ted Baillieu.
He led the coalition to defeat in November 2014 and he resigned as leader in favour of Matthew Guy.
Dr Napthine and Mr Mulder - a former Roads and Public Transport Minister - went to the back bench after the election defeat.
The former premier denied he planned to quit after the election and said he planned to see out his four-year term.
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