One of the side's players, Luke Arscott, had tactical information about the Sale Sharks' defence revealed to him by his brother Tom, a winger for the Sharks, the night before the two teams faced each other in January. Sale lost 24-23.
Tom Arscott's contract was terminated on January 20 after disciplinary action and Sale triggered an investigation by the Rugby Football Union.
Luatua's move to Bristol in the British summer for next season was announced on Tuesday.
