Detectives from the Armed Crime Squad have released a CCTV image of a man they are searching for following an armed robbery at a Werribee gaming venue last week.

The man entered the venue via a Werribee Street North entrance about 9.30pm on Sunday, 31 March.

He was armed with a firearm and wearing an open-faced balaclava.

The man approached a staff member and made a demand for cash, threatening them with the firearm.

The cashier gave the man a quantity of money and he left the premises via the same entry point.

He was last seen getting into a white, older model sedan that was parked in a neighbouring street.

No one at the venue was physically injured during the incident.

Detectives from the Armed Crime Squad are investigating and have released an image of a man they wish to speak to in relation to the incident.

They are keen to speak to anyone who may recognise him or have further knowledge of the armed robbery.

Police are also appealing for anyone who may have dash cam vision of the man and the white vehicle to come forward.

Anyone with information is urged to contact Crime Stoppers on 1800 333 000 or make a confidential on-line report at www.crimestoppers.com.au