The attack happened on Saturday, March 24 at about 12.40am, when a man was beaten in an unprovoked attack leaving him with facial swelling and bruising, cuts and bruising to his right eye and injuries to his back.
He was left unconscious following the attack at the bar in Silver Street, Doncaster.
Police are appealing for help in identifying three men believed to be involved in an assault.
The men are all described as white and in their 20s. One of the men has distinctive tribal tattoos on both of his arms and one was wearing glasses.
Anyone with information as to the identity of the men is asked to call the police on 101, or Crimestoppers on 0800 555111, quoting incident number 613 of 28/03/2012.