The team has agreed to terms on a one-year deal with free agent cornerback Jacob Lacey. The 24-year-old Lacey has played his entire three-year career with the Indianapolis Colts, but was not offered a restricted free agent tender.
The Oklahoma State product has started 27 games. Last season he appeared in 15 games and recorded 72 tackles and one interception.
The Lions have also re-signed defensive tackle Andre Fluellen. Last season Fluellen appeared in 13 games, recording 11 tackles and a forced fumble.
In 2011 the Lions were in the bottom half of the league, giving up 24.2 points per game.