The Liberals and the Greens have denied doing a deal after both parties registered preference-free how to vote cards with the Victorian electoral commission.

Earlier this month Premier Denis Napthine said the Greens would be placed last on all Liberal how to vote tickets because the party could not be trusted on the economy or jobs.

On Saturday the Greens and Liberals registered "open tickets" which means that they do not  instruct voters where to send their preferences. The parties have also registered preference tickets.

The Greens registered open tickets in all 88 lower house seats, while the Liberals lodged open tickets in four Labor-held seats vulnerable from Greens: Melbourne, Richmond, Brunswick and Northcote.

Preference flows in those seats will be crucial to the outcome in the four districts.

Greens state director Larissa Brown said the Greens would not preference the Liberals ahead of Labor in any seat. She said there was no deal and no negotiation with the Liberal party.

The Liberals on Sunday admitted the cards were created as part of the negotiation process. But Dr Napthine was adamant the Greens would remain last.

"The Liberal Party will be handing out how to vote cards that preference the Greens last. Absolutely, handing out how to vote cards, we are doing it now at the pre-polls," Dr Napthine said.

The registered cards sent a wave of anger through the Labor party, who accused both parties of being hypocrites.  Labor's Martin Pakula said Dr Napthine's pledge to put the Greens last was being undermined.

"It is Liberal panic versus Greens hypocrisy," Mr Pakula said.

Northcote MP Fiona Richardson said it was head-spinning hypocrisy.

"If the Greens claim there is no deal with the Liberals and that their ticket lodgement of mutually advantageous how to vote cards is all just a coincidence, then somebody please put money on porky pigs airlines taking to the sky," Ms Richardson said.

Ms Brown said the Greens always registered open and preference how to vote cards, with local branches then able to choose.

But she also said if there were open tickets it would be in very few seats.

"The inner city seats will not be running open tickets," Ms Brown said,.