Rangers face a UEFA sweat that may see them play their Europa League crunch against Young Boys at an empty Ibrox.
Disciplinary chiefs in Nyon are awaiting reports from their match delegate at the game against Feyenoord in De Kuip.
Rangers fans belted out sectarian chants before the 2-2 draw to the tune of “Sweet Caroline” and also let off flares in the away end.
UEFA’s Control, Ethics and Disciplinary Body have already closed off sections of Ibrox as a result of previous illicit singing this season against St Josephs and Legia Warsaw.
Under their articles of association, a third charge could lead to a full stadium closure as the Light Blues seek the point they require to make the last 32.
Rangers avoided playing their first match of Group G against Feyenoord behind closed doors after they refused to take tickets to the second fixture of the group against Young Boys.
They also released a strongly worded statement at the time that read: “Those fans responsible for this partial closure of Ibrox need to understand that they are damaging our club.”
Rangers have declined to comment on the latest controversy.
