Celtic have been fined £11,000 by Uefa for fans setting off flares and throwing objects during the 4-1 Europa League play-off win over AIK in Sweden last month.
The Hoops booked their place in the group stage of the competition with a 4-1 win at the Friends Arena in Stockholm, going through 6-1 on aggregate.
AIK have been fined £7,000 for stairways being blocked.
Their previous punishment came in 2017 when they were forced to pay £8,900 after a fan ran on to the pitch and tried to kick Paris Saint-Germain striker Kylian Mbappe in the Champions League.
Celtic claimed Swedish supporters had infiltrated the away end as fans and police clashed at the Friends Arena in Stockholm.
Celtic also face Italian side Lazio and CFR Cluj of Romania in Group E.
Neil Lennon’s men are currently top of the Scottish top flight, having amassed 15 points from their opening five league games.