Toulouse players Trevor Brennan and Gareth Thomas will both face misconduct complaints following the controversial Heineken Cup clash against Ulster last Sunday.
Disciplinary hearings for both players will be convened as soon as possible.
Former Ireland forward Brennan and ex-Wales captain Thomas will attend disciplinary hearings following an initial investigation by European Rugby Cup disciplinary officer Roger O'Connor.
Brennan allegedly assaulted Ulster supporter Patrick Bamford after leaving the playing area at Stade Ernest Wallon and climbing into a seated area.
Thomas is alleged to have engaged in what ERC term "aggressive exchanges with spectators" and/or "aggressively attempted to enter one of the seating areas" and/or "made an offensive hand gesture towards spectators."
While Brennan is no longer part of the Ireland set-up, Thomas remains an integral member of Wales' Six Nations plans, with their tournament opener - against Ireland - just 10 days away.
If the complaints are proved, both players could expect a ban and fine.
ERC have also announced further investigation into the behaviour of a section of Ulster supporters, and Toulouse's alleged failure to control their players with regard to the incident.
Brennan (33) claimed he was provoked by Ulster supporters as he warmed up with fellow Toulouse substitutes behind the posts.
Brennan allegedly punched Bamford several times, leaving the 25-year-old accountant requiring medical treatment at the ground and on his return home to London. Agencies
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