Nats quietly confident ahead of Vic poll

Whether it is Liberal or Labor that triumphs in the Victorian election, either could rely on a minor party to form government, says Nationals leader Peter Ryan.

The deputy premier said a returned Napthine government would likely again require another formal coalition between the Liberals and Nationals.

When his country-based party won 10 seats in the 2010 poll it was the first time in 50 years the Liberal Party relied on Nationals-held seats to form a majority in the lower house.

Mr Ryan said he was "quietly confident" of repeating the 2010 result on November 29.

"We, as a party, are in our strongest position on the floor of the Legislative Assembly since 1985 and I hope to be able to report the same outcome after this election," Mr Ryan told AAP.

"I think it is likely that if we are able to secure the vote of Victorians enough to form government, it will be on the basis of the current coalition agreement with the Liberal Party.

"It would be a coalition government."

Unlike federally and in other states, Victoria's Nationals and Liberals are uncommon bedfellows in a coalition government.

The 2010 election was the first case of a formal coalition agreement between the parties and it was the first time the Liberals had to rely on Nationals-held seats to form government.

The Nationals were in coalition with the Liberals during Victoria's Kennett years, however the Liberals still had enough seats to rule in their own right.

Mr Ryan said he feared another possible coalition outcome - a tie-up between Labor and the Greens.

"There is the distinct prospect in Victoria of having a coalition in government but it would be a coalition between the Labor party and the Greens," Mr Ryan said.

"The Greens are increasingly confident of winning at least two seats from Labor, and the very last thing Victoria wants is to have the instability that we saw in Canberra where Labor and the Greens wrought absolute havoc."

Labor leader Daniel Andrews has ruled out forming a coalition government with the Greens.

"No deal will be offered and no deal will be done," Mr Andrews told reporters on Saturday.