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.
Wales will host the opening games of the Singha Premiership Rugby 7s Series at the BT Sport Cardiff Arms Park as the four Welsh Pro teams go head-to-head in an exciting afternoon of summer derby rugby.
The sun is out and Cardiff Blues are inviting rugby players to slap on the sunscreen and hit the beach this summer with the first-ever Cardiff Blues Beach Rugby competition on Saturday, July 4 on Barry Island Beach!
One of the most eagerly awaited events of the British motorsport calendar - the British FIM Speedway Grand Prix - will return to the Millennium Stadium on Saturday, July 4 - and at Cardiff Blues we've got FIVE PAIRS of tickets up for grabs!
The players at Cardiff Blues will be hoping to play with some true Gallic flair for the rest of the Guinness PRO12 season - after the region teamed up with a successful French bistrot in the Welsh capital.