Batman 'will be Green this one or next'

The Greens remain confident they can snaffle the inner-Melbourne seat of Batman from Labor - if not on Saturday at least at the next election.

But Greens leader Richard Di Natale concedes it would be a "Herculean effort" to gain the 10 per cent swing needed to pick up the seat from Labor MP David Feeney, who made headlines after failing to declare his interest in a $2.3 million negatively-geared property.

"I'm confident and hopeful that if it's not at this one, it will definitely be at the next election," Senator Di Natale told reporters in Melbourne on Thursday.