Rookie safety Delano Howell was signed to the Indianapolis Colts' active roster from the practice squad of the Buffalo Bills. Howell entered the league as an undrafted free agent from Stanford. He played in one game with the Bills and was waived, then re-signed, twice. Offensive guard Seth Olsen was cleared to return to practice, but remains on injured reserve. Olsen has played in 12 career games, including the first three games of the 2012 season with the Colts before he was placed on injured reserve Oct. 8. The Colts have three weeks to determine whether to activate Olsen.