I have just been thinking, how is the keeper identified offically in a football match, I mean say for example Given was injured all subs used and O'Shea
went in goal. Would it be possible for someone else go in goal at a later point or would it have to be O'Shea for the rest of the match?
I mean if O'Shea got injured that means you have to play without a keeper?
I think the answer might be the keeper has to be designated but how is this done or can someone else just run in goal and say i'm the keeper now?