Police are investigating two armed robberies at the same business in Carnegie over the last few weeks.
Detectives have been told on both occasions a man has entered the Woorayl Street store and has produced a knife.
The man then makes demands for store attendants to open the cash register, stealing cash and alcohol before leaving on foot.
The incidents took place on Sunday 16 June at 9.40pm and Wednesday 3 July at 9.20am.
The staff were not physically injured during the incidents.
The man is described as about 182cm tall with a large build and was wearing jeans, a dark jacket and a black 'Pizza' hat.
Investigators have released an image of a man they believe may be able to assist with their enquiries.
Anyone with information is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report online at www.crimestoppersvic.com.au.
