A former Wakefield Wildcats player almost lost an eye after he was attacked outside a nightclub.
Sean Gleeson, who played for the Superleague club from 2007 to 2010, was assaulted in Wigan.
Mr Gleeson, 26-year-old was punched in the face several times outside the Ibiza Bar on King Street on Sunday, March 2.
He is still being treated in hospital for serious injuries to his eye and eye socket.
Mr Gleeson, who is currently a Hull KR player, could be left with permanent damage to his sight.
Det Chief Insp Howard Millington, from Wigan division, said: “A young man has been left with serious, potentially life changing, injuries as he could lose his eye. Imagine if this was your son, brother, cousin, or close friend who was ill in hospital, you would want answers.
“In addition, if anyone was there that night and saw the assault or if you know something that might be relevant to our investigation I would urge them to get in contact with police. You might not have seen the actual attack but you may have seen a group of white men running away. I would urge anyone who thinks they may know who is responsible to come forward and speak to us.
“We all have a responsibility to ensure that a night out is a good experience and does not escalate into drunken violence that compromises people’s safety. “
Two men, aged 21 and 24, have been arrested on suspicion of assault and have been released on bail pending further enquiries.
Det Sgt Peter Carletti from Wigan division, said: “While we have made two arrests we are continuing to appeal for anyone with information or who witnessed the incident to speak to police.
“You might not have seen the actual attack but you may have seen a group of white men running away. I would urge anyone who thinks they may know who is responsible to come forward and speak to us.”
Anyone with information should call police on 0161 8567259 or Crimestoppers, anonymously, on 0800 555 111.