Japan head coach Eddie Jones says the frequency and severity of sanctions being handed out to players during international matches is getting out of hand.
Ireland claimed their record-biggest win over Australia, while there were also wins for Wales and France in international Test rugby action on Saturday.
South Africa's record Test cap holder Victor Matfield was full of praise for the Springboks after their stunning win over France in Paris over the weekend.
Springbok lock Lood de Jager has been banned for four Tests after receiving a red card for foul play against France in Paris last weekend.
Springbok prop Wilco Louw has praised his teammates for holding their nerve in a hostile Stade de France atmosphere on Saturday night.
Springboks captain Siya Kolisi hailed his team's ability not to panic as they dug in to secure a 32-17 victory over France in Paris, despite being down to 14 players.