Cranbourne police are hoping to identify a man following a theft and an attempted theft in Cranbourne in May.
Investigators have been told a man entered an electronics store at a High Street shopping complex about 3.50pm on 29 May.
The man attempted to steal a pair of Bose headphones and was confronted by a staff member.
He threatened the staff member, claiming he had a knife, before leaving the store empty handed.
Shortly afterwards the man entered a bottle shop at the complex and stole an amount of liquor.
Police have released an image of a man they believe may be able to assist with their investigation.
Anyone who recognises the man or with information is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report online at www.crimestoppersvic.com.au.