Matt Finnegan said when he visited her then-husband Mark's property in Stockport in 2014 it was clearly her main home.
The Labour Deputy Leader has insisted she lived separately from him at her ex-council house about a mile away.
Greater Manchester Police is investigating whether Ms Rayner broke electoral law over allegations she may have given false information about her main residence a decade ago. She denies any wrongdoing.
Mr Finnegan, who left her employment with a £20,000 payout and non-disclosure agreement after accusing her of disability discrimination and unfair dismissal, said he "vividly" remembers visiting her around the time she became a parliamentary candidate.
In a statement to the force, reported by a newspaper, he said: "There was no doubt in my mind that this was Ms Rayner's family home, where she lived with her then-husband, Mark."
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Slo torture as Brits waste a golden chance to end hoodoo
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