Celtic have been fined £21,000 by UEFA for incidents which saw their fans display an offensive banner and set off fireworks during their Europa League match against Udinese.
The incidents, back in December, had been included in the match delegate's report and the club were fined on February 23 for breaching article 11 of its disciplinary regulations.
Those regulations include prohibiting the lighting of fireworks and "the use of gestures, words, objects or any other means to transmit any message that is not fit for a sports event, in particular if it is of a political, offensive or provocative nature".
The banner which appeared at the Stadio Friuli on December 15 criticised European football's governing body, saying 'F*** UEFA', and Celtic banned for life one fan who was arrested in Italy over the alleged assault of a club steward, and who they say was one of those responsible for the banner.
Manager Neil Lennon and chief executive Peter Lawwell hit out out at the ''rogue'' element within their support on the day after the game.
The club also vowed to sift through photographic evidence to find those fans responsible for the use of the flares, warning that they will take ''appropriate action''.
Lawwell said: ''It is very frustrating. Those people are not Celtic supporters. We will weed them out and these guys will not get back into Celtic Football Club.
''One or two silly little juvenile boys doing funny kids' pranks and stuff is bringing the whole of Scottish football down.''
Lennon added: ''My only surprise is that they got the spelling (on the banner) right. I am very disappointed, they have let me down, they have let the board, players and background staff down and 99.9% of the support down.''