POLICE are continuing to investigate a violent attack in Sydney's Kings Cross that left one man with facial injuries and another fighting for life.

Nightclub staff are alleged to have chased a group of three men who had been refused entry to the Trademark Hotel, in the city's nightclub heartland, on December 18.

It led to nearby Darlinghurst Rd, where an argument took place and two of the group suffered injuries.

The first, a 27-year-old, sustained facial injuries and has since been released from hospital.

A second, 33-year-old man remains in a critical condition at St Vincent's Hospital.

He suffered serious head injuries and remains in an induced coma.

A 36-year-old bouncer, reported to be former NRL player and boxer John Hopoate, was arrested on December 19 and charged with assault occasioning actual bodily harm and affray.

Police released CCTV images today in the hope of tracing a number of potential witnesses.

"There were a large number of people in Darlinghurst Road who witnessed the incident, many of whom are depicted in CCTV footage," Kings Cross Police Commander Superintendent Tony Crandell said.

He said police would like to speak with a number of people who were at a taxi stand nearby.

Originally published as Police release CCTV of Hopoate 'attack'