The resignations of the Victorian Speaker and Deputy Speaker over the "appalling" abuse of parliamentary entitlements is the "right decision" and changes will be made to ensure the rules are black and white, Premier Daniel Andrews says.

Key points: Positions of Speaker, Deputy Speaker were 'untenable': Premier

Positions of Speaker, Deputy Speaker were 'untenable': Premier Entitlements will be changed to ensure the rules are 'black and white'

Entitlements will be changed to ensure the rules are 'black and white' Audit Committee will decide if Nardella must repay entitlements

Mr Andrews said he spoke to the Speaker, Telmo Languiller, and Deputy Speaker Don Nardella on Saturday to tell them their positions were untenable and they should resign.

"That, in my judgement, was the only course of action left to them," he said.

Mr Languiller (left) and Mr Nardella were told their positions were untenable. ( Supplied: Victorian Parliament )

Mr Languiller, the Labor member for Tarneit, and Mr Nardella, the MP for Melton, resigned after it was revealed both men who represent seats in the western suburbs had claimed an allowance intended for country MPs.

"Is it any wonder there is a cynicism, a scepticism that there is a distrust of so many members of Parliament when we see behaviour — appalling behaviour like this?" Mr Andrews said.

He said he would make "important changes" to make sure it could never happen again.

The Special Minister of State, Gavin Jennings, was tasked with the job of examining the second residence allowance and whether or not there were any other allowances that would not meet community expectations.

"Essentially I've asked the Special Minister of State to give me advice on changing the rules so that this can never happen again and that the rules, as we look to the future, are black and white," he said.

"No room for interpretation no room for what has occurred here, to ever happen again."

Under parliamentary rules, politicians are entitled to the "second residence" allowance if their home base is at least 80km from Melbourne's CBD and they keep a second property in the city.

Mr Languiller, who told Parliament he moved to Queenscliff, 80 kilometres from Melbourne because of "complex family reasons", had promised to repay $37,678 he claimed under the allowance.

However in a statement on Saturday, Mr Languiller said he recognised that offering to repay the money was not enough and that he accepted he should "pay for that error of judgement".

Allowance meant for regional MPs

But it was unclear if Mr Nardella would repay his allowances, claimed to be as much as $100,000.

Mr Nardella said he had responded to a media question about his primary and secondary residence and associated parliamentary allowances.

"I responded truthfully and fully to that request for information," he said.

"I have acted in accordance with all rules regarding Member of Parliament allowances."

Opposition Leader Matthew Guy said it "beggared belief" that Mr Andrews would get a Labor MP to audit the entitlements when it was Labor MPs who had been abusing the system.

"This money needs to be repaid," Mr Guy said.

"This issue will not go away until this money is paid by Don Nardella. He owes the Victorian taxpayer more than $100,000 in rorted money and Daniel Andrews must make him pay that back.

"If he doesn't then Daniel Andrews is complicit in this rorting of Don Nardella."

Mr Andrews said he would leave the decision of repayment up to the Audit Committee of Parliament, which was examining the matter, to decide.