Gloucester's Olivier Azam has been cited for the kick, which heinsists was accidental, and will appear before a Rugby Football Union disciplinary panel in Bristol on Tuesday.
Veteran ex-Wales fly-half Arwel Thomas - playing in what heinsists was the last of his many 'final games before retirement' - missed the straight-forward conversion.
Mayweather has promised Hatton a "rude awakening", but the 28-year-old Mancunian insistshe is happy to let the American talk as much as he wants before the fight.