The brawl occurred in the car park of a community hall on Bridge Street at Lidcombe just before midnight on Saturday March 19.
NSW Police allege the man was assaulted with a machete.
“The injured man was treated at the scene by NSW Ambulance paramedics before being taken to Westmead Hospital with serious head injuries, including fractures and a subdural haemorrhage,” NSW Police said in a statement.
“The man underwent surgery, and his recovery is ongoing.”
All of the suspects are described as being Pacific Islander or Maori in appearance, about 175cms tall and medium to large build.
”Two of the men are captured leaving the carpark in the CRV, which travelled eastbound on Tooheys Lane and briefly stopped outside Lidcombe Railway Station, where a third man entered the vehicle,” NSW Police said.
Anyone with video of the incident is urged to contact Crimestoppers on 1800 333 000.