If you hate yourself, the Yanks Abroad forum on BigSoccer is the best place. Each player has their own thread and anything even resembling news will be posted there. However, BigSoccer also contains some of the most delusional, negative and idiotic posters I have ever seen so consider yourself warned. The YA board isn't nearly as bad as the USA one though I try to stay away from the whole site unless I'm really looking for something.
Specifically for Zelalem there won't be much since he will rarely, if at all, play at Arsenal this season and anything regarding his citizenship will find its way here anyway.