Mustapha (hamstring) won't practice Wednesday, Matt Barrows of The Athletic reports.
Mustapha was the starting free safety for the 49ers in 2025 after returning from knee surgery, but he has been competing with Marques Sigle to keep the job. This setback will allow Sigle to show himself as a more consistent and productive option, so Mustapha will need to show out once he returns to the field.