Rangers: Outsiders had role in violence
Rangers believe the trouble in Manchester city centre which marred the UEFA Cup final involved many people with no known history of following the club.
Rampaging fans were described as a "disgrace" who could have jeopardised England's bid to host the 2018 football World Cup, Prime Minister Gordon Brown warned on Thursday.
Rangers security chief Kenny Scott told Sky Sports News: "We have to identify anybody that was responsible for any of these acts of violence. The club will take the appropriate action. The difficulty is of course that many of these people will have no association with Rangers Football Club and that exacerbates our difficulties in dealing appropriately with the situation."
Brown condemned the supporters involved in violent clashes with police on Wednesday night - and said public drinking laws would also be reviewed.