49ers' Vernon Davis leaves with concussion
Davis was attempting to haul in a pass deep in Seattle's end late in the first quarter Sunday night.
Davis caught the pass but was immediately knocked off his feet by Chancellor, jarring the ball loose. Davis was slow to get up, was examined by doctors on the sideline and eventually taken to the locker room for further evaluation.
Davis had one catch for 27 yards in the first quarter. He was held without a reception when the teams played in October.
Manningham was on the ground for several minutes before being helped off the field and being taken to the locker room on a cart.
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