Charvis and Grau face ban
Welsh flanker Colin Charvis and Argentina prop Roberto Grau risk a World Cup ban after being cited for punching during Friday's opener.
Saracens forward Grau was shown the yellow card by referee Paddy O'Brien after the incident with Charvis in the 13th minute of the home side's 23-18 win at the Millennium Stadium.
The duo now face a disciplinary hearing on Monday to determine their fate.
If the hearing decides there is a case to answer for either player, they could face a suspension of up to 12 weeks.
Charvis, who scored the first try of the World Cup, and Grau were cited for punching by the citing commissioner at the game, Piet Nieuman of South Africa.
A statement from tournament organisers Rugby World Cup said: "A
disciplinary hearing will be established under the disciplinary regulations of the International Rugby Board and will meet on Monday in Cardiff with Sir Alan Holland, an eminent former New Zealand high court judge, as chairman.
"There will be two other members of the disciplinary committee who are
still to be named. They will be an eminent former rugby administrator and former player."
The loss of Swansea star Charvis, 26, would be a massive blow for the Welsh after his powerful performance at the Millennium Stadium.
Wales face Japan and Samoa in the next 12 days, so any sort of ban would be a setback to Charvis's hopes of playing a leading role in his side's World Cup bid.
If Charvis were to be sidelined, coach Graham Henry could have to turn to Geraint Lewis, the only other specialist blind side flanker in the Wales squad.