The San Francisco 49ers got a boost to their secondary last weekend when second-year safety Malik Mustapha made his season debut after beginning the year on the Physically Unable to Perform (PUP) list.

Mustapha had been recovering from a torn ACL that he sustained in Week 18 of last season, but was able to come back around the expected timeline and was immediately thrown into the fire last week, playing 39.6 percent of the defensive snaps.

While Mustapha will continue to ramp up, he’s a clear starter at safety for the 49ers, where the team has rotated quite a bit this year. The other position opposite to him is not so clear.

San Francisco began the year starting Jason Pinnock and Marques Sigle at safety. However, Ji’Ayir Brown began to see some work at the big nickel spot and then crack

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