Duplicating a player help?

I created a custom club from scratch but rather than creating players from scratch I duplicated existing players in the editor, changed there names etc and added them to my club. They show in the editor but when i start a new game the team is there but the players are not.

I have created hundreds of created players before without issue but this is the first time i have used the duplicate option

Any ideas?

Just an update. I moved one of the duplicated players to another team and they showed in game. I transfer Lukaku to my created team and then he didn't show in-game. So the problem stems from the team not the players.