10 Dec, 12:23
Ireland's John Lacey will referee his first ever RBS 6 Nations match in February, while Alain Rolland is also included in the Elite Panel in what is his last season.
There has been growing opposition to the use of seven substitutes in a game, a point recognised by the IRB.
Rugby's governing body said yesterday: "The IRB is well aware that a substantial proportion of the game's stakeholders take the view that there are too many substitutions/replacements in matches at international level.
"The amendment would reduce the present number from seven and would limit the total number of replacements/substitutes to a maximum of four."