Those matches categorised as “Tier 1” internationals by the IRB will have IRB-appointed independent Citing Commissioners and independent single Judicial Officers whereas in all other matches, either involving a “Tier 2” nation or a non-international team, the Six Nations office co-ordinates the appointment of an independent Citing Commissioner and the Chairman of the Six Nations Disciplinary Panel (Professor Lorne Crerar) will appoint an independent three-man disciplinary committee if a hearing is required.

In all matches the Citing Commissioner has 48 hours from the end of the match in which to decide whether to cite a player. Hearings for red cards and any citings will normally be held on the Tuesday or Wednesday following a weekend match.

The Citing Commissioners appointed for this weekend's matches are:

Saturday 10 November 2012 – all times GMT

Italy v Tonga (Tier 1 v Tier 2), Stadio Rigamonte, Brescia (14:00) – Jean-Claude Legendre (France)

England v Fiji (T1 v T2), Twickenham (14:30) – Achille Reali (Italy)

Wales v Argentina (T1), Millennium Stadium (14:30) – John Byett (England)

Ireland v South Africa (T1), Aviva Stadium (17:30) – Douglas Hunter (Scotland)

France v Australia (T1), Stade de France (20:00) – Freek Burger (South Africa)

Sunday 11 November

Scotland v New Zealand (T1), Murrayfield (14:30) – Murray Whyte (Ireland)