Central defender Jack made his England bow at U19 level against Slovakia at Crewe Alexandra in September 2010, ironically llning up alongside his club-mate Angus MacDonald in the defence that night.
He had already been on the international radar prior to that though, as U19s Head Coach Noel Blake had previously named him in his standby squad for the European U19 Championship Finals in France in May 2010.
A tall and dominant player, Mills has been impressive for Reading at Academy and reserve team level.