A police search for a man missing more than eight months has been postponed.

Divers en route to search an abandoned mine site in the state's Central Highlands were redirected to Kilcunda, near Phillip Island, in response to reports of a missing fisherman.

Homicide squad missing persons unit detectives are investigating the suspicious disappearance of 48-year-old Ricky Lee Ganly in April 2013.

Police say Mr Ganly, from Deer Park, was last seen by his girlfriend at his Doherty Street home about on April 28 last year.

He has not accessed his bank accounts or been seen since.

AAP