Detectives from Melbourne and Geelong searched his renovated warehouse but Thompson was not arrested. Victoria Police issued two statements on Friday, the first at 10am.

"Detectives from Southern Metro Divisional Response Unit and Geelong Divisional Response Unit are executing a warrant at Port Melbourne," the statement said.

"Detectives attended at the Rouse Street address at 9.30am this morning. No arrests have been made and the investigation is ongoing."

A virtually identical statement was sent at 3pm on Friday. He is expected to be interviewed on Tuesday.

Divisional Response Units investigate property crimes and illegal drug activity (including cultivate, manufacture and traffic), according to Victoria Police.

Police said on Monday there was no update to its earlier statements. When contacted by Fairfax Media on Saturday, Thompson, 54, denied his home had been raided.

Thompson led the Cats to premierships in 2007 and 2009 but quit the club in 2010 to join Essendon, the club he had once captained, as a senior assistant to James Hird.

He became embroiled in the supplements saga which led to 34 past and present Essendon players being suspended for the 2016 season.

Thompson was fined $30,000 for his role in the scandal, one which had seen him replace a suspended Hird as coach in 2014 but later lose any interest in the sport.

He revealed last year the saga had made him "bitter and twisted" and had contributed to the breakdown of his marriage to his second wife Jana.

"I know more of what happened than probably most people, I've read that much about what was going on - it's incredible," he said.

"And it just sits in my guts and churns and it still does and it's going to probably end up killing me because I can't let it go. People tell me I've got to let it go, but I can't.

"I know what happened. I know that there were things that were added to the report, things were taken out of the report not to be seen.

Thompson said the architect of the injecting program, disgraced sports scientist Stephen Dank, should never have been hired by the Bombers.