Police are searching for two men following an armed robbery of a service station at Horsley Park on September 21.
One was armed with a gun as they entered the service station on The Horsley Drive at 2.40am.
A 26-year-old employee was hit in the face and ordered to hand over money.
The men fled on foot and were last seen heading west toward the M7 motorway.
The shop attendant was treated at the scene before he was taken to Liverpool Hospital.
He suffered bruising and concussion.
Police have released CCTV images of the two men who they believe may be able to assist with the investigation.
The first man was wearing a black hooded jacket featuring a white motif and text.
The other was wearing a black jumper with white writing.
Anyone who may know the identity of the men in the images or have information should contact Fairfield Police on 97288399 or Crime Stoppers on 1800333000.