Police have released CCTV footage of a vicious assault of a young man in Sydney's west in a bid to identify his attackers.

The 39-year-old man was walking past the Rose and Crown Hotel on Victoria Road in Parramatta when a group of three men allegedly yelled out to the man just before 11pm on January 25, police said.

Detective Inspector Glen Parks said the man continued walking along Victoria Road but was allegedly attacked from behind by two of the men as he approached the bus stop near Brabyn Street.

The CCTV footage shows the man, who is on the ground and concealed by a parapet, being repeatedly kicked with full force by two men.