France's controversial replacement of Uini Atonio by Rabah Slimani in the closing stages of their 2017 6 Nations win over Wales has been referred to the tournament's Untoward Incident Review Group.
Slimani had already been substituted but the superior prop was allowed to return to the field when France's team doctor sent Atonio for a head injury assessment in the 81st minute.
A converted try after 20 minutes of added time handed the hosts a dramatic victory in Paris, but the re-emergence of Slimani left Wales interim head coach Rob Howley to declare: "There is evidence to suggest the integrity of the game has been brought into disrepute."
Tournament organisers have now finished their initial assessment of the incident and have decided a further review is needed.
In a chaotic finish, Wales wing George North claimed he was bitten by an opponent - but the commissioner was unable to conclude that any particular player had carried out "an act of foul play" and no further action was taken.
France forward Yoann Maestri was also fined £26,000 after he accepted a misconduct charge following allegedly critical post-match comments he made to the media about referee Wayne Barnes.