Overview
- NFL insiders and the team reported on Friday that Bosa pulled his calf during practice and is ruled out for Sunday’s Week 3 game against the Arizona Cardinals with an expected absence of a few weeks.
- The 49ers are weighing an injured-reserve placement that would mandate a minimum four-game absence, but sources say the club is leaning against IR because it has limited return-designation spots to use this season.
- Bosa’s loss compounds heavy turnover up front: the team already has Alfred Collins (season-ending torn patellar tendon), C.J. West and Sam Okuayinonu on IR, plus James Thompson Jr., Romello Height and Mykel Williams sidelined or limited, leaving few veteran edge options.
- Coach Kyle Shanahan said the injury is not believed to be season-ending and that Bosa will return, and reporters note he was managing a recent ACL recovery after missing much of 2025.
- In the short term the 49ers have promoted and signed defensive linemen from the practice squad and will rely on Keion White, Ogbo Okoronkwo and Khalid Kareem, and the team’s decision on IR and Mykel Williams’ practice window are the key items to watch next.