Celtic have been billed over supporters behavior in the Europa League experience on Thursday with Cluj.
Disciplinary proceedings are opened from the Scottish champions after enthusiasts set off fireworks in the group-stage fixture in their competitions.
Integrity, the UEFA control and disciplinary body will deal with the situation at its meeting.
Celtic won the game 2-0 to go top of Group E after two games and bunch Italian side Lazio on October 24.
The Parkhead club had been #11,000 for lovers pitching objects in August at Stockholm and putting off flares.
Since they were beaten 2-0 from Livingston in the Scottish Premiership celtic suffered a setback.
The defeat implies Celtic are second in the table.
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