Detectives are appealing for public assistance following an armed robbery at a service station in Cranbourne last week.

Investigators have been told two men attended a petrol station at the intersection of Narre Warren-Cranbourne and Thompsons road about 2am on Wednesday 27 January.

The pair entered the store and walked around for approximately 5-10 minutes before approaching the counter and threatening the attendant with a knife.

The men stole cash before leaving the store on foot.

No one was injured during the incident.

The first male offender is perceived to be of Asian appearance, aged in his late teens to early 20s, 160cm tall, with a thin build and long black hair that was tied back in a ponytail.

At the time of the armed robbery he was wearing a black New York Yankees cap, black Puma hoodie, dark pants and red shoes.

The second male offender is perceived to be of Caucasian appearance, aged in his late teens to early 20s, 175cm tall with a medium build.

He was wearing a black cap, black EMINEM t-shirt with a grey short sleeve shirt over the top, red pants and black shoes.

Police have released images of two men they believe may be able to assist with their enquiries.