cuarto árbitro 6
In football, the fourth referee is something like a substitute referee, who can replace the central referee or one of the linesmen in case either of them can no longer exercise their functions, due to an injury, for example. Other functions of the fourth referee are: to maintain order and calm in the benches of both teams, to write down and report the changes and make them known to the teams, spectators and the media, among other functions.