The San Francisco 49ers ' secondary got a bit thinner late in the Week 4 game against the Denver Broncos .
The team announced slot cornerback Upton Stout is questionable to return with a shoulder injury. It's unclear when the injury occurred, but he was seen jogging to the locker room in the fourth quarter.
This article originally appeared on Niners Wire: 49ers lose another CB as Upton Stout suffers shoulder injury

