Celtic have been fined €23,000 (A$33,836) by UEFA after fans unfurled an 'illicit banner' during their UEFA Champions League second-qualifying round second-leg clash with Linfield.
A section of fans at Parkhead unfurled a banner featuring a person in paramilitary uniform at the game, which Celtic won 4-0 to seal a 6-0 aggregate win.
In the wake of the incident, Celtic released a statement that read: "Any support for a paramilitary or proscribed terrorist organisation has no place at Celtic Park."
The fine was also imposed for stairways being blocked, but the club were not punished over a charge relating to a kit infringement.
Celtic drew 0-0 with Rosenborg in their third qualifying round first-leg game on Thursday morning AEST.