The Patriots opened up a pair of roster spots on Monday by placing two players on injured reserve and filled one of them on Tuesday by plucking a player off of the Ravens practice squad. Linebacker Nicholas Grigsby is making the move from Baltimore to New England. Grigsby joined the Ravens after being released by the Rams prior to the start of the regular season. Grigsby appeared in six games for the Rams last year, including a 26-10 loss to the Patriots in Week 13. He saw 130 snaps on special teams in those games without seeing any time on defense.