SANTA CLARA -- Starting strong safety Jaquiski Tartt, who has already missed two 49ers games this season with a shoulder injury, did not practice Tuesday after leaving Sunday’s game because he aggravated the injury.
In addition, Tartt’s backup Antone Exum will not have time to clear concussion protocol before Thursday’s game against the Raiders, 49ers coach Kyle Shanahan said.
Tyvis Powell, who struggled late in the 49ers’ 18-15 loss to the Arizona Cardinals on Sunday, could get the starting assignment at strong safety against the Raiders.
“Obviously, there are some plays, some things that he wants back,” 49ers defensive coordinator Robert Saleh said of Powell.