Celtic have been hit with a 12th UEFA fine in the space of six years with the total bill up to about £170,000.
Here, Press Association Sport lists the Hoops' recent run-ins with UEFA's disciplinary body.
December 2011: Celtic are fined £12,700 after fans sing pro-IRA chants during a Europa League clash with Rennes in Glasgow.
March 2012: A £21,000 penalty is issued after supporters set off fireworks and unveil an insulting banner aimed at UEFA during their Europa League fixture with Udinese in Italy.
September 2012: The use of fireworks at Celtic Park during a Champions League qualifier with Cliftonville costs the Scottish title winners another £4,200.
December 2013: The club are fined around £42,000 after the Green Brigade unveils "illicit banners" featuring IRA hunger striker Bobby Sands before a Champions League match with AC Milan.
September 2014: UEFA fines Celtic £15,900 after fans display a Palestinian flag during a Champions League qualifier against KR Reykjavik.
February 2015: The club are fined £7,300 after Celtic fans clash with rival supporters and Croatian police during a Europa League group stage match against Dinamo Zagreb. The fine also punishes Celtic for the supporters' use of fireworks.
March 2015: Flares set off by Celtic fans during a Europa League clash with Inter Milan at the San Siro incur a £3,600 sanction.
February 2016: A £10,000 fine is issued for using fireworks following a Europa League tie with Fenerbahce in Istanbul, although a portion of the fine related to the "improper conduct" of the team.
August 2016: Fans again flew Palestinian flags in the Champions League qualifier against Israeli side Hapoel Be'er Sheva, prompting UEFA to fine the Scottish champions £8,616 for the use of "illicit banners".
February 2017: More fireworks and crowd disturbances during a Champions League match against Manchester City at the Etihad Stadium are punished with a £16,050 fine.
July 2017: Celtic are fined £20,000 for crowd-related offences during a Champions League home qualifier against Linfield, including blocked stairways and another "illicit banner" featuring a paramilitary-style figure.
October 2017: Celtic are fined £8,900 after 21-year-old supporter John Hatton raced on to the Parkhead pitch and aimed a kick at Paris St Germain striker Kylian Mbappe in the Champions League match in September.