How is the substitution mechanism in football matches carried out?

The substitution mechanism in football matches is an important means for clubs or national teams to adjust their lineup during the game. The system is designed to help teams cope with injuries, fatigue or situations that require a change in tactics.

In football, each team has three opportunities to make substitutions. Substitution can occur at any time, except for ongoing corners and goal shots. In addition to injury substitutions under special circumstances, substitutions will usually be made at half-time or during added game time.

The coach can make substitution decisions based on the game situation and the needs of the team. The purpose of substitutions may be to increase attack power, strengthen defense, adjust tactics or stabilize the situation. Normally, substitutions will affect the team's overall lineup and tactical direction.

When the coach decides to change, he will inform the replaced player in advance so that he is ready to leave. Players who are replaced must abide by the rules and leave the game field as soon as possible so that new players can enter the game as soon as possible. When new players enter the field, they have to wait for the referee's permission on the sidelines. Normally, players can only enter the competition venue when the game stops.

When the player completed the substitution, he was deemed unable to play again. In other words, once a player is replaced, he will not be able to return to the game. This is to ensure that the team does not abuse the substitution mechanism.

The substitution mechanism in football games provides coaches with the opportunity to adjust their lineup and tactics. Through reasonable substitution decisions, teams can adjust and optimize their performance during the game. The existence of the substitution mechanism adds variables and suspense to the game, and also brings more enjoyment to the fans.