Glad you've said this... I am sitting here thinking I could stay quiet and suggest I knew this, but I genuinely didn't.
I genuinely thought you were nominating a player to be excluded from taking a penalty so that both teams have the same number of penalty takers.
I must say I've never thought of it that deeply because it's never happened to me... but the applicable wording from LOTG is...
- If at the end of the match and before or during the kicks one team has a greater number of players than its opponents, it must reduce its numbers to the same number as its opponents and the referee must be informed of the name and number of each player excluded. Any excluded player is not eligible to take part in the kicks
It's not one of those things that reading the laws over and over is going to change your thoughts on. You only know, if you've read and interpreted it correctly or if it's come up.
Clearly by 'taking part in the kicks' it means take part at all in any aspect of 'kicks from the penalty mark' (although this should probably be updated in line with it now being referred so as a penalty shootout.)
If you've interpreted that to mean that the excluded player can't take a kick.... as I had... then I don't think it's necessarily indicative of a referee with generally poor law knowledge. I'm not sure how somebody who initially interpreted it that way, would then know any different, without being asked a question directly about it, seeing it happen, or having it crop up in conversation some other way.
An unfortunate scenario, but one I'm glad happened to someone else and now I will know better for if it would happen to me.