Six Nations officials are reviewing events in the closing stages of Wales' 20‑18 loss to France, including an alleged bite on wing George North.
Wales coach Rob Howley was left to "question the integrity of our game" after France replaced Uini Atonio with Rabah Slimani 11 minutes into the 20 minutes of added time that were played.
France's team doctor said Atonio needed to go off for a head injury assessment.
North, meanwhile, said he was bitten in the build‑up to France's final try.
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