Labor MP David Feeney's own tenants have turned on him and urged locals in the Melbourne seat of Batman to vote for Greens candidate Alex Bhathal.

In another blow to the Labor frontbencher, who is locked in a bitter struggle to hang on to his seat, a Greens placard has been posted in the front yard of his $2.3 million Northcote investment property - which Fairfax Media revealed on Tuesday was undeclared on the Register of Members Interests.

The billboard promoting Ms Bhathal was erected on Wednesday after The Age newspaper splashed the story on its front page on Wednesday.