Reference to additional permanent concussion substitutions is found in:

The provision as it is printed, and everything on Ruleside that turns on it.

The referee and other match officials, especially the fourth official:

· are not part of a team's decision-making process as to whether a player should be substituted or not, nor whether a player should be replaced by a ‘normal substitute' or a ‘concussion substitute';

The Laws of the Game are published by The IFAB and quoted here for the purpose of explaining the decisions on this site. Ruleside is not affiliated with The IFAB or FIFA. Every clause of Notes and modifications that Ruleside cites.