Prahran Embona have released CCTV following an armed robbery in St Kilda last month.
The incident occurred in Acland Street around 4.30pm on Thursday 26 September.
Armed with a bar two offenders chased the victim from a fast food restaurant on the corner of Acland Street and the Esplanade, south along Acland Street towards Barkley Street.
The victim, a man aged in his late teens, sought refuge in a cake shop on Acland Street but the offenders followed him in.
The duo began assaulting him inside the cake shop before dragging him out onto busy Acland Street.
Once outside, two of the offenders have assaulted the boy, kicking, punching and striking him with the pole.
The two offenders fled north along Acland Street where it is believed a third offender was waiting.
The first man police wish to speak to was perceived to be of Mediterranean appearance, thin build and approximately 20 years old. He was clean shaven, had short dark hair and was wearing a black long-sleeved top that had Caterpillar branding on it and grey pants.
The second man police wish to speak to was perceived to be of Mediterranean appearance and approximately 20 years old. He had short brown coloured hair. He was wearing a yellow high visibility jacket, brown shorts and brownish coloured work boots.
The third man police wish to speak to had red or brown hair, was of medium height with a fair complexion. He was wearing a blue puffer vest, chequered shirt and cream chino pants.
Police have released the following images of men they believe may be able to assist with their enquires.
Investigators are urging the three men involved to come forward and hand themselves in.