As the Victorian Greens vie for balance of power in both houses of state parliament, the party will launch its biggest ever election campaign ahead of next month's poll.

After a week when Labor lost two candidates in two days ahead of the November 24 election, it will be the minor party's turn in the spotlight on Saturday.

The Greens have already proven a threat to the major players in inner-Melbourne seats and snatched an additional electorate - Northcote - from the Labor government at a by-election late last year.

Australian Greens leader Richard Di Natale will on Saturday attend the state party's launch, "rolling out a high energy, grassroots campaign".

In the current Victorian parliament, the Greens have three lower house MPs and five places in the legislative council.

The party has already revealed its policy framework ahead of the November 24 election, including commitments to phase out community poker machines within a decade and offer free ambulance cover.

While Labor premier Daniel Andrews has ruled out forming government with the Greens, the minor party's leader Samantha Ratnam has urged the incumbent government to consider a coalition.

"If the people of Victoria do vote us into the balance of power, I think it would be wise of Premier Andrews to talk to the Greens," she said recently.

Internal party polling reportedly shows Labor could win power if an election was held this weekend, but might be forced into minority government, The Australian reports.

Labor polling shows its primary vote is at 52 per cent to the coalition's 48 per cent, while the Liberal polling reportedly has the gap at a narrower 51 to 49 per cent.

Labor and the Liberal-Nationals coalition are expected to hold their campaign launches on Sunday.

On Friday Labor slotted in a new candidate, retired ambulance union state secretary Steve McGhie, for the lower house seat of Melton after the withdrawal of the previous contender, who cited family reasons.

As one new player was brought in, the party lost another, with Peter Lockwood withdrawing his candidature for Bayswater. A replacement is being sought.

Nominations close on November 8.