Leinster prop Cian Healy has been cited for an alleged knee strike on Toulon hooker Guilhem Guirado.
Healy received a yellow card from referee Nigel Owens for the incident, which came in the 26th minute of last Sunday's game at the Stade Félix Mayol.
Citing commissioner John Byett (England) made the complaint and a disciplinary hearing, chaired by Roger Morris of Wales, will be held in Paris on Thursday ahead of the return game between the two sides at the Aviva Stadium on Saturday.
The sanctions under ‘Law 10.4 (a) Striking with the knee’ range from three weeks at the low end to 52 weeks at the top end.