Is it true that a player can only substitute into the set when the head coach signals for it?

In volleyball, a player can enter the match as a substitute without the need for a specific signal from the head coach. While it is customary for coaches to request substitutions, the actual authority to allow substitutions is held by the officiating crew, typically the first referee. This official ensures that the substitution process follows the regulations outlined in the rulebook, which allows for substitutions to occur at appropriate times during the game, such as stoppages due to regular play or when the ball is out of play.

This flexibility allows for smoother gameplay, as it prevents the need for constant coaching intervention for substitutions. Additionally, it enables teams to manage their lineup throughout the match effectively. Therefore, the statement that a player can only substitute into the set when the head coach signals for it is inaccurate.