Fish and chip shopfront damage in Sydney

Police are trying to confirm if a bullet caused damage to a fish and chip shopfront in Sydney's south.

A man opened Hooked on Seafood on the Princes Highway at Sylvania on Sunday morning to find damage to the front window.

Police tape surrounded the shop throughout most of the day and the windows were still intact.

A nearby business told AAP there was one bullet hole in the window.

Police say a crime scene was established but no forensic or ballistic evidence was located.

Investigators are trying to confirm whether a bullet, rock or another projectile caused the damage.