Hey, I love that you brought this topic back up.
I have to say it was annoying to constantly receive BB-mails froms managers saying: "Hey, it says that my 18 year old made the U21 team but now I don't see him there. What gives?".
I agree that the announcement should either be for the player's first game or after he has been on the team for a while. Either that, or just get rid of it altogether.
Run of the Mill Canadian Manager