Melbourne Crime Investigation Unit detectives have released the images of four men following an affray in Melbourne's CBD earlier this year.
Investigators understand two groups of men had an altercation which erupted into a brawl on Russell Street, near Little Bourke Street, about 12.50am on Sunday 31 January.
One male was knocked unconscious and repeatedly punched while on the ground.
He suffered facial injuries as a result of the incident.
Police are releasing images of four men they believe could assist with their enquires.
They are perceived to be aged in their 20s.
One was wearing a distinctive brown/tan jacket, a white shirt, dark pants and brown shoes.
Another was wearing a brown and white striped shirt with blue jeans and brown shoes.
A third man was wearing blue jeans, a dark-coloured tee-shirt and dark shoes while the fourth was wearing blue jeans, a dark coloured top and white shoes.
Investigators are appealing for the men to come forward.
Anyone who recognises any of the men or has information that could assist police with their enquiries is urged to contact Crime Stoppers on 1800 333 000 or log onto www.crimestoppersvic.com.au.
