Six Nations Rugby say they 'will be reviewing' the alleged bite on George North and potential breach of head injury protocol surrounding Uini Antonio during Wales' 20-18 loss to France.
Wales coach Rob Howley was left to "question the integrity of our game" after a controversial end to the match.
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"Six Nations Rugby is aware of concerns about the head injury assessment that took place towards the end of the match," they said.
"We are looking into the matter."