Not quite sure who he will declare for or if he has played for sweden. I understand his mother is Irish. From my research he has a brother called sean.
You would imagine that if he becomes a top player and is breaking into Bayern's team or goes on loan to another club and is doing well, he will either declare for sweden or ireland. While we aren't a top team, he would feel confident of playing in tournaments with us whereas luxembourg are unlikely to make a tournament. From a purely clinical point of view, i think he is unlikely to stay with them.