Halifax RL winger Wayne Reittie was left in hospital after suffering facial injuries in an alleged attack.
The Leeds-born winger is thought to have suffered a broken jaw and a fractured eye socket.
He is expected miss the start of season due to the injuries and there is speculation he will be out of action for up to 16 weeks.
Halifax RL issued a statement, saying: “Wayne Reittie has suffered extensive facial injuries in an off-field incident.
“We are disappointed for the player and the club and it is likely to be some weeks before he will be able to return to training.
“There will be no further comment at this time.” Reittie, a former Batley and York player who lives in Leeds, joined Fax from Batley at the end of the 2011 season and scored seven tries that year.
During 2012 he cemented his place as a first team regular and was part of the side which won the Northern Rail Cup.