Under what condition may a player change positions with the goalkeeper?

A player may change positions with the goalkeeper during a stoppage in play, provided that the referee is informed of the change. This rule exists to ensure that the game flows smoothly and that all participants are aware of player roles, especially because the goalkeeper has specific privileges and responsibilities that differ from those of field players.

Changing positions seamlessly during active play could lead to confusion about player eligibility for certain actions, such as handling the ball. By requiring that the referee is informed during a stoppage, it maintains clarity and order on the field.

The other conditions listed do not correctly align with the rules governing player position changes. For example, changing positions at any time without informing the referee could disrupt the game and lead to unfair situations, while changing positions only before kick-off or after a goal does not cater to the dynamic nature of a soccer match.