Photo: abc.net.au

The incident happened at the corner of A’Beckett and Swanston streets on Friday 5 May at 7.40pm when a man was seen abusing three women on the footpath.

The victim, a 43-year-old Ringwood man, went to the aid of the women and was assaulted by the man, receiving several punches to the face and head.

The victim sustained bruising and grazes in the attack.

The women and the man had left the scene by the time police arrived.

Investigators have released CCTV footage of a shirtless man walking along the street prior to the assault who they think can assist with their investigation.

Anyone with information or anyone involved in the incident is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential crime report at www.crimestoppersvic.com.au.