Hume Crime Investigation Unit detectives are investigating an aggravated burglary and assault at a Craigieburn restaurant last month.
An unknown man attended the Craigieburn Road restaurant on a bicycle about 1am on Tuesday, 23 February.
Investigators have been told the man approached the front counter and made demands for cash.
When a staff member refused, the man climbed over the counter and began punching and kicking him.
The offender pulled the victim towards the front counter while making his demands, but the victim managed to free himself and move away.
The man followed the victim before returning to the front counter a short time later.
He then stole cash from the register before fleeing the premises on his bicycle, travelling north on Dorchester Street.
The victim, a 24-year-old Bundoora man, was treated at the scene for non-life-threatening injuries.
Investigators have released CCTV and images of a man who they believe can assist with their enquiries.
The man is perceived to be Caucasian in appearance, aged late 20s or early 30s, approximately 177cm tall, short orange hair with a distinctive tattoo on his right forearm.
He was wearing a black hooded jumper with a white logo on the front and back, light-coloured shorts and blue Nike runners.
He was carrying a blue Nike backpack and riding a bicycle with a white seat.
Anyone who recognises the man or with information is urged to call Crime Stoppers on 1800 333 000 or log into www.crimestoppersvic.com.au.
