Police are appealing for public assistance to help locate missing Boronia man Tighearnan.
The 19-year-old last made contact with family around 11.30am on Tuesday the first of October.
He was driving a grey 2010 Mitsubishi Lancer and may be in the Bayswater, Wantirna or Golden Beach areas.
He is described as 178cm tall with a thin build, blue/grey eyes and brown hair with a buzz haircut.
Tighearnan was last seen wearing a black hoodie with blue and pink writing/picture and black cargo pants.
He has a nose piercing, a tattoo on his left thigh of a bumble bee holding a flower and wears a silver chain necklace.
Police and family have concerns for his welfare due to the amount of time he has been missing.
Investigators have released an image of Tighearnan in the hope that someone can provide information on his current whereabouts.
Anyone with information is urged to contact Knox Police Station on 9881 7000.