A political analyst suggests the Greens are already confident of the outcome from tonight's meeting on Darleen Tana. 

More than 200 delegates will discuss whether to ask the Speaker to remove Tana from Parliament. 

The now-independent MP has lodged an appeal against a High Court decision supporting the party's disciplinary process against her. 

Victoria University's Bryce Edwards says this has dragged on and on for the Greens. 

"I think they should have stepped back from this months ago - it's already an embarrassment - but now they've gone down the path. I think Chlöe Swarbrick would really need to know she's got the backing."

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