Dandenong Crime Investigation Unit detectives are appealing for public assistance following an assault in Noble Park on Monday night.
It is believed an altercation broke out between two males at the intersection of Douglas Street and Frank Street just before midnight.
The victim was assaulted and rendered unconscious by an unknown male before his wallet and phone were stolen.
The offender then fled the scene prior to police arrival.
The victim, a 32-year-old Dandenong man, was later transported to hospital with serious upper body injuries.
It is understood the victim and the offender had met for the first time on the night of the incident.
Investigators have released CCTV footage and still images of a man they believe could assist them with their enquiries.
The man is perceived to be in his 20's, with dark hair and a moustache.
At the time he was wearing a bright orange beanie and a black jumper with a white logo on the front.
Anyone who recognises this man or who witnessed the assault is urged to contact Crime Stoppers on 1800 333 000 or file a confidential report online at www.crimestoppersvic.com.au
