The Patriots are placing linebacker Shea McClellin on injured reserve, according to ESPN.com’s Field Yates. The nature of his injury is currently unknown. 
McClellin missed most of the preseason with his mystery ailment. Whatever the issue is, it won’t rule him out for the year as he remains a candidate for one of the team’s IR-DTR spots.
McClellin, a former first-round pick of the Bears, signed a three-year, $9MM deal with the Patriots in 2016. He appeared in 441 snaps for New England last year and made some athletic plays, including his memorable leap over the line of scrimmage to block a field goal against the Ravens in December.
To fill his spot on the roster, the Patriots re-signed running back Brandon Bolden. He had just just one carry last season and spent the bulk of his time on special teams.