Most professional sports leagues tend to make their rules changes all at once, but Major League Soccer has always been an exception to that. Today, they announced another rule change: Teams will get a fourth substitution during the playoffs that can only be used during extra time.
Now, this sort of rule is an interesting one, and it’s hardly an MLS exclusive. FIFA has talked about doing it, it’s been instituted in the FA Cup, and that rule is currently undergoing an IFAB trial. IFAB, the International Football Association Board, is the body responsible for the Laws of the Game.