Williams was shown a red card by referee, John Lacey, in the 24th minute of the Cardiff Blues v Montpelier match for an alleged dangerous tackle on the Montpellier scrum half, Benoit Paillaugue
The Blues scrum half will now travel to Dublin on Thursday for the hearing. Jeremy Summers (England) has been appointed as the independent Judicial Officer for the hearing. The decision will be communicated in advance of this weekend's Round 4 matches.
Cardiff Blues face a triple header against the Irish provinces on home soil in the Guinness PRO12 in the coming months - and you can join us at BT Sport Cardiff Arms Park with a special ticket offer available NOW!
Judgement Day IV, Welsh rugby's Guinness Pro12 double-header to be played out in Cardiff on Saturday 30th April, has sold out the Principality Stadium middle and lower tiers and is three months ahead of record sales figures hit last year.
Singapore will host the next stage of the #StayStrongForOws fundraising and awareness campaign next month - that will also see former Cardiff Blues and Wales star Owen Williams return to the city where his life changed forever.
Join Cardiff Blues for Wales' home matches in the 6 Nations with our fantastic hospitality packages at BT Sport Cardiff Arms Park - but act quickly to take your place with our Scotland packages now SOLD OUT!