Boroondara police are investigating an assault which occurred at a licensed premises in Kew in May, Victoria Police say.
Officers have been told that two men were involved in a verbal altercation inside the premises on High Street, Kew about 8.30pm on 31 May.
The altercation escalated and the offender punched the victim to the face while holding a beer glass.
The victim, a 20-year-old man from Kew, suffered a cut to the chin.
The victim and offender then traded a number of blows before the offender was ejected from the premises by security.
The offender is perceived to be Caucasian, 175cm tall, with short dark hair and had a three day growth.
Investigators have released an image of a man that they believe may be able to assist with their enquiries.
Police are urging anyone with information to contact Crime Stoppers.