Celtic have suspended Green Brigade members' tickets for away games, starting with the trip to face Hearts at Tynecastle on Sunday.
The Parkhead side state the ban is due to trouble caused at recent away matches against Feyenoord and Motherwell.
It is unclear how long the policy will last for as it is pending a review. However, the Green Brigade are expected to still have access to home games, including the Champions League group stage fixture against Atletico Madrid next week.
A Celtic spokesperson said: "As the group in question has been informed in writing, this decision to suspend access to away tickets relates to very clear and extremely serious unsafe and unacceptable behaviour at recent away matches, including those against Feyenoord and Motherwell.
"As an example, at Feyenoord, widespread and unsafe use of pyrotechnics resulted in another fine for the club from Uefa.
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"Investigations are ongoing in relation to unsafe behaviour at Motherwell, including rushing turnstiles and forcing open fire exits to permit access to individuals without tickets.”
The Scottish Sun claim that the ban has nothing to do with the recent display at Celtic Park after the October 7 attack on Israel and that Parkhead chiefs have had concern over behaviour at away fixtures for months.
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