Police are appealing for public assistance to help locate missing man Brett.
The 44-year-old left his home address in Iona on 17 July.
Brett is described as being about 180cm tall, with a medium build, short brown and grey hair and a moustache and beard.
Police and family have concerns for Brett's welfare due to a medical condition.
It is believed Brett might be travelling in a black Ford Ranger, registration 1KR8DA. The vehicle has a flare kit of the side and modified black wheels. It also has a canopy and an army sticker on the back.
He is known to frequent the Lake Eildon and Bunyip State Forest areas.
Police have released an image of Brett in the hope someone may know of his current whereabouts.
Anyone with information or anyone that may know of Brett's whereabouts is urged to contact Pakenham Police Station on 5945 2500.
