In soccer it is my assumption that any player can exchange their position say defender to forward etc. without waiting for the ball to leave play or without making any explicit indication to the other team.
I would like to know how this applies to the goal keeper:
- Can any player assume the role of goal keeper?
- Do they need to change clothing with the goal keeper?
- Do they need to announce this change to either the referee or opposing team?
- Do they need to wait for the ball to leave play?