The Victorian Greens have sent a warning to the Andrews Government, saying it will have to negotiate with them to get their policies through the new parliament.

The Greens won two seats in the Lower House at last month's state election as well as five seats in the Upper House.

Greens leader Greg Barber said Premier Daniel Andrews will have to talk to the Greens about their priorities, including public transport, action on climate change and reforming the Freedom of Information Act.

"If he doesn't want to keep losing seats to the Greens, then he's got a choice to make between now and the next election," he said.

"He either needs to start adopting our policies or he needs to negotiate with us to work with us to implement some of our policies.

"And bear in mind, he won four seats in the Lower House off the Liberals, but he's lost three seats to the Greens."

"No bill is going to pass the Upper House unless the Greens or the Coalition decide to support it."

Mr Barber said the Premier will also need to talk with the other minor parties - the Shooters and Fishers, the Sex Party, the Democratic Labour Party and the Vote 1 Local Jobs party.

"Now [Daniel Andrews] is in government, well of course he's got something of the same dilemma that Tony Abbott's got hasn't he?" Mr Barber told 774 ABC Melbourne.

"He went in as you know, Mr Strong, vote for me, I am going to do x,y and z, but now he needs to be Mr negotiator and think about some of the policies put forward by some of these other parties."

Mr Barber said the controversy during the last parliament, where independent MP Geoff Shaw held the balance of power, would not happen this time.

"You had one person who was effectively the balance of power in the Lower House, and both parties totally opportunistically trying to get his vote for their own ends," he said.

"That's not going to happen in the Upper House because you're going to need the Greens in there and we'll be the honest brokers, unless you see Labor and Liberal go off in a corner somewhere and make their own deals."

Mr Barber said Victorian voters were not prepared to give either major party full control of Parliament and the Greens would make sure the Government did not "trade off" on big issues to meet one of the microparties' smaller agenda items.

"We're going to be very vigilant to ensure they're not actually off doing secret deals to water down gun control, or whatever it might be, in return for getting the passage of their own legislation.