KANSAS CITY, Mo. (AP) — The Chiefs’ depth in the defensive backfield is already being tested. Starting safety Kendrick Lewis is out with a right shoulder injury he sustained early in the Chiefs’ preseason loss to the St. Louis Rams on Saturday night. Lewis was helping to make a tackle when he appeared to hurt his shoulder, and he immediately left the game. His right arm was in a sling after the Chiefs’ 31-17 loss. Kansas City coach Romeo Crennel said Sunday that Lewis will miss “a bit of time,” but did not provide details on the injury or a more definitive timetable. Lewis is expected to wear a sling for several more days before starting a rehab program, but Crennel said the two-year starter is not considered a candidate for injured reserve.