Liberal candidate for Boothby Nicolle Flint has urged Australians to be “very careful” about who they vote for as a “vote for the Greens is a vote for Labor”.

A new poll has indicated 27 per cent of the people who voted for Labor at the last election would not vote for them now.

“I think the key message here, regardless of how the numbers might move around from poll to poll, is that a vote for the Greens is a vote for Labor and really sort of vice versa,” Ms Flint told Sky News host Paul Murray.

“People need to be very careful about where they’re … putting their vote.”