Could also add that during first week of season it is possible to go through players smoothly. Later in the season you will loose enthusiasm for your team so any national team that will do this will sacrifice the teams chances of doing well as the enthusiasm moves very slowly for national teams. Enthusiasm is namely reset at end of first week of season to 5 which is reason why you can check players abilities. So if your player is chosen for national team first week he might still not be close to a place in it.