Nick Bosa to Miss Multiple Weeks for 49ers with Calf Injury

San Francisco 49ers defensive end Nick Bosa will miss multiple weeks after pulling his calf during high-knees in a Thursday pre-walkthrough warmup. While expected to sit out against Arizona, the team opted to keep him on the active roster rather than place him on crowded injured reserve. Bosa, who had logged four pressures through two games after returning from a torn ACL, headlines a massive 49ers defensive line injury crisis that has sidelined six of their 10 key linemen. Coach Kyle Shanahan expects him to return later this season.