Police are appealing for public assistance to help locate missing man Andrew Collett.
The 40-year-old Montrose man was last seen at a View Street, Healesville address about 2.00pm Monday 18 November.
It is believed he may be travelling in a green Toyota Landcruiser wagon registered 1NR1DJ.
Police and family have concerns for his welfare as he has a medical condition.
Investigators have released a photo of Andrew in the hope someone may recognise him and be able to provide information on his whereabouts.
Anyone with information is urged to contact Mooroolbark Police Station on 9725 9999.