A lawyer involved in a case affecting an investigation into a Green MP understands it's not close to wrapping up.

MP Darleen Tana's been stood down for the past two months during investigation of allegations of migrant exploitation at the business of her husband, Christian Hoff-Nielson.

Lawyer Alex Kersjes represents some of Hoff-Nielson's former workers.

He says both his clients were interviewed last week.

"It would seem there's still very much in the investigative phase, the last query I had was trying to find an email trail between Tana and our clients."

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