Based on this it looks like he is eligible for one of the 2 spots for "players with no more than two accrued seasons". It seems like you can qualify under 3 scenarios: No accrued seasons, 1 accrued season but on the active roster less than 9 games, or no more than 2 accrued seasons (max of 2 of these). Also, you can keep an international player who lives outside the U.S.