The International Rugby Board has announced that Adam Thomson's one-match ban for his use of the boot against the head of Scotland's Alasdair Strokosch may be extended.
The lenient penalty has predictably prompted outrage in the United Kingdom.
Former England hooker and UK TV rugby pundit Brian Moore said on Twitter that it was a "very poor decision" which sent a "very bad message".
Moore's tweet was responded to by IRB chief executive Brett Gosper, who said: "The IRB will review this case as it is a match under our jurisdiction. If we decide to take action we will make it public."
Stamping and trampling normally carry bans from between two weeks to one year, depending on the severity of the situation.
Thomson's ban was reduced from two matches to one match due to his good disciplinary record and Strokosch commenting that he believed the stamping was accidental.
Strokosch said: "It certainly wasn't malicious. There was no damage done. He barely grazed [my head]. I would say the yellow card's fine. I wouldn't take it any further. It wasn't a big deal."
Australia's Rob Simmons was given an eight-week ban for a tip tackle on France's Yannick Nyanga on the same day as the Thomson ruling, which creates a bizarre discrepancy in discipline enforcement.