KANSAS CITY, Mo. (AP) — The offensive line that the Kansas City Chiefs aggressively overhauled this offseason has taken a hit. Veteran Kyle Long suffered a knee injury during voluntary workouts that could require surgery and keep him out of training camp. The 32-year-old Long came out of a one-year retirement designed largely to get him healthy to sign a one-year contract with the Chiefs, who completely recast their offensive line after it was decimated by injuries and opt-outs last season. But he failed to make it through three weeks of workouts before another injury sidelined him.