Aaron Wilson of Profootball.scout.com reports the Titans have signed third-round defensive lineman Mike Martin to a four-year contract, according to his agent, Rick Smith.
Martin played in the Senior Bowl after recording 172 career tackles for the Wolverines.
The 6-foot-1, 306-pound nose guard had 10 career sacks, 25 tackles for losses, one forced fumble and a safety.
Martin was a second-team All-Big Ten Conference selection last season.