Police are seeking public assistance to help locate missing man John Sullivan.
The 71-year-old was last seen at his Greenvale residential care facility at 3pm on 4 December.
Police and have concerns for his welfare as John has a medical condition.
He is likely to be travelling on foot and does not have his phone or any money.
John is approximately 180cm tall, solid and about 90kg.
Investigators have released an image of John in the hope someone recognises him and can provide information regarding his current whereabouts.
Anyone who sees John or has information about his current whereabouts is asked to contact the Broadmeadows Police Station on 03 9302 8222