What action constitutes illegal participation during a soccer game?

Participating while suspended is considered illegal participation because it directly violates the rules governing player eligibility. When a player is suspended, they are forbidden from taking part in any matches for a specified period, typically due to disciplinary actions or accumulated yellow cards. This rule is enforced to maintain the integrity of the game and ensure fair play. Allowing a suspended player to participate not only undermines the authority of the officials but also affects the competitive balance of the match, as a suspended player may have an impact on the game's outcome.

Other actions, such as a player returning to play after a red card or bench personnel shouting at officials, may lead to penalties or disciplinary actions but do not meet the specific definition of illegal participation in the same way. Coaches making tactical changes is a normal part of the game strategy and does not constitute illegal participation.