CIRU became aware after the match that three players were ineligible to play, yet were used anyway in the Test match, played on August 4.
The loss to lowly-ranked Tahiti was a huge upset for the home side, who were expected to romp over their opponents and continue playing for World Cup qualification.
The visitors received a huge boost from players bought over from France, three of whom were played illegally.
CIRU now awaiting a response from the Tahiti Rugby Union, who were notified about the complaint soon after the game.
More on this story soon in CINews