Dundee United are investigating reports of crowd trouble at their Europa League qualifier against Dynamo Moscow last week.
A statement on the club's website read: "Dundee United is carrying out an internal inquiry into the events during Thursday night's Europa League tie v Dynamo Moscow.
"Any individual found to have been involved in unacceptable conduct and damaging the club's proud reputation will face a stadium ban.
"The club continue to foster the UEFA spirit incorporated within the RESPECT campaign and actively encouraged the promotion of these values in our strategy for Thursday's match and we are extremely disappointed that the actions of one or two individuals have been seen to damage what was yet another special European night at Tannadice."
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