Exum (concussion) will not play against the Raiders on Thursday, Eric Branch of the San Francisco Chronicle reports.

Exum sustained a concussion during Sunday's loss to the Cardinals, and it's no surprise that the rotational safety will not clear the league's concussion protocol during a short week. With Jaquiski Tartt (shoulder) questionable for Week 9, San Francisco may ask either Jimmie Ward, Tyvis Powell or K'Waun Williams to slot in at the strong safety position.

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