Bears signed veteran quarterback Mark Sanchez to a one-year deal, the team announced Friday.Sanchez, who visited the Bears on Thursday, provides additional depth behind starter Mike Glennon.The Bears prioritized finding another proven backup to work alongside Glennon, who hasn't started a game in over two years. The only other quarterback on Chicago's depth chart is Connor Shaw, who missed the entire 2016 regular season because of a broken leg he suffered in the team's fourth exhibition game. Prior to joining the Bears, Shaw played in just one regular-season game for the Cleveland Browns in 2014.