The International Rugby Board (IRB) will review the disciplinary process that led to New Zealand's Adam Thomson receiving a one-match ban for "stamping or trampling" on the head of Scotland's Alasdair Strokosch.
Thomson will miss the All Blacks' Test against Italy in Rome on Saturday, but he will be available for the remainder of New Zealand's European tour.
Thomson was yellow-carded for making contact with Strokosch's head during New Zealand's 51-22 victory at Murrayfield and later cited.
Thomson was given a two-week ban, reduced to one week on account of his conduct in the hearing – a suspension described by former England hooker Brian Moore as "ludicrously lenient."
IRB chief executive Brett Gosper responded on Twitter. Gosper wrote: "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."
Samoan centre Eliota Fuimaono-Sapolu compared the verdict with the three-week ban he received from the RFU for tweets about Owen Farrell.
"I got 3 weeks for sarcastic tweets. So had I just rucked Farrell's head I would have got only a week? It's just so comical," he said.