Uefa says it has warned Champions League participant Shakhter Karagandy that it could face disciplinary action if it continues the ritual slaughter of animals before matches.
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The club from Kazakhstan killed a sheep last week at the Astana Arena the day before beating Celtic 2-0 in the playoffs.
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In Glasgow ahead of Wednesday's return match, Shakhter coach Viktor Kumykov suggested the ritual could be repeated.
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Uefa says its competitions department wrote to inform Shakhter that animal slaughter "was not acceptable in or around our competitions."
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Uefa says the Kazakh club "would face sanctions if it happens again."
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Shakhter, the lowest-ranked team remaining in the Champions League, is aiming to reach the 32-team group stage for the first time.