Melbourne Crime Investigation Unit detectives are investigating after a man was injured during an altercation on Flinders Street earlier this month.
It is understood the victim, a 53-year-old man, was approached by an unknown man outside Flinders Street Railway Station on Friday, 11 April about 2:55am.
Officers have been told the offender struck the victim in the head, before he fell to the pavement and lost consciousness.
The unknown man fled on foot towards south on St Kilda Road.
The victim was taken to hospital with non-life-threatening injuries.
Investigators have released images of a man they believe might be able to assist with their enquiries.
The male is perceived as being of Aboriginal or Torres Strait Islander appearance and is in his 30's.
He was seen wearing dark clothing and was carrying a black and red backpack with a white hard-hat attached.
Prior to the assault, the offender was seen walking north from St Kilda Road.
The investigation remains ongoing.
Anyone who witnessed the incident, has CCTV/dashcam footage or information is urged to contact Crime Stoppers on 1800 333 000 or www.crimestoppersvic.com.au
