The Titans signed Niemann on Monday, Jim Wyatt of the team's official site reports.
Niemann will head to Tennessee after starting nine games for the Cardinals last year. The 27-year-old is coming off one of the most productive campaigns of his career, logging 70 tackles (38 solo), which was a new high for him. Heading into this season, Niemann may have the opportunity to compete with Monty Rice and fellow newcomer Azeez Al-Shaair for a regular role at inside linebacker.