The SFA president is also unhappy about newspaper photos that appeared to show the Rangers pair making V-signs while sitting on the bench during Wednesday's game.
Late in the game, television pictures seemed to capture captain Steven Gerrard flashing what looked like a V-sign at referee Andre Marriner after the midfielder was booked but both Benitez and club officials have played it down.
Police have claimed that starting the Huddersfield v Hull game at 17:20 GMT to enable live TV coverage raised the risk of alcohol-related disorder and additional measure were put in place.