Breida (shoulder) will miss the rest of the preseason, Adam Schefter of ESPN reports.
After an MRI didn't reveal any structural damage in Breida's separated shoulder, 49ers coach Kyle Shanahan said he expects the second-year running back to be ready for Week 1. However, the injury is still a small ding to Breida's fantasy prospects, as additional preseason work might have helped him make a case to take a large chunk out of Jerick McKinnon's workload. The Niners will turn to Joe Williams, Jeremy McNichols or Raheem Mostert for the No. 2 RB job if Breida isn't available Week 1.