Northampton and England hooker Dylan Hartley will face a disciplinary hearing in Dublin on Thursday.
The Saints captain was cited for allegedly striking Ulster counterpart Rory Best with his arm during a Heineken Cup pool encounter at Franklin's Gardens last Friday.
European Rugby Cup has announced that Wales' Roger Morris has been appointed as independent judicial officer to hear the complaint against Hartley.
If found guilty, Hartely faces a ban of anything between two weeks for a low end entry point, to a maximum 52-week suspension.
Cardiff Blues and Wales scrum-half Lloyd Williams has also been summoned to appear in Dublin on Thursday after he received a red card for an alleged dangerous tackle against Montpellier two days ago.
And Dragons flanker Jevon Groves faces a Thursday hearing as well following his red card for an alleged dangerous tackle during his side's Amlin Challenge Cup victory over Italian side Mogliano last weekend.