Scarlets tighthead prop Samson Lee has been cited for allegedly stamping during the team's 33-26 Heineken Cup victory over Harlequins on Saturday.
Lee was shown yellow by referee John Lacey for striking scrum-half Danny Care with a boot in the second-half of the Twickenahm Stoop clash.
He will appear before an independent judicial officer in Dublin on Thursday, the European Rugby Cup confirmed on Tuesday.
If the citing is upheld, the Scarlets front-row faces a ban ranging from two to nine weeks.
Perpignan centre Lifeimi Mafi will also appear at the disciplinary in Dublin after being sent-off for a dangerous tackle on Gloucester's Ryan Mills.