Because it is the offseason, McMillan won’t be eligible to be activated off injured reserve for New England at any point this year. He would be able to join another team if he’s released by the Patriots with an injury settlement, however.
McMillan had 35 tackles, a sack and a fumble recovery last season. He had 204 tackles, three forced fumbles, and a fumble recovery in 45 games for the Dolphins and Raiders before coming to New England.
Patriots place Raekwon McMillan on injured reserve - ProFootballTalk