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(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.