Six members of the Australian National League side Canterbury Bulldogs are the subject of assault allegations, following an incident at the weekend.
Australian police confirmed a complaint had been made by a 21-year-old woman, and appealed for witnesses.
Bulldogs chief Steve Mortimer wants a review of the club's code of conduct.
Their players have had past problems. In 1991 Julian O'Neill trashed a hotel room and John Hopoate was banned for 12 weeks in 2001 for violating opponents.
Mortimer added in a statement: "The Bulldogs are fully cooperating with the police.