San Francisco 49ers defensive star Nick Bosa is set to miss the Week 3 matchup against the Arizona Cardinals after suffering a calf injury in practice. The latest Nick Bosa injury update adds another concern for a San Francisco defensive line already dealing with several significant injuries.
Bosa pulled his calf during Thursday’s practice and did not participate in the session. The five-time Pro Bowl defensive end is now expected to miss Sunday’s NFC West contest at Levi’s Stadium, with the 49ers considering whether to place him on injured reserve.
Nick Bosa Injury Could Keep Him Out for Multiple Weeks
The latest reports indicate that the Nick Bosa injury could sideline him for multiple weeks. If San Francisco places Bosa on injured reserve, he would be required to miss at least four games before becoming eligible to return.
The decision is particularly important because the 49ers have a limited number of injured-reserve return designations available during the season. San Francisco can designate only eight players to return from IR, creating a difficult roster-management situation for head coach Kyle Shanahan and the coaching staff.
Bosa played 70 defensive snaps during the first two games of the 2026 season after returning from a major knee injury.
Bosa Had Been Recovering From ACL Injury
The current calf problem comes after Nick Bosa spent the offseason recovering from a torn ACL in his right knee. He suffered that injury during Week 3 against the Cardinals last season.
The timing of the new injury is notable because Sunday’s game would have taken place almost exactly one year after Bosa suffered the ACL injury against the same opponent.
Bosa successfully returned to begin the 2026 season and featured during San Francisco’s opening two games. However, he was listed as a non-participant on Wednesday with a knee-related rest designation before the calf injury was added on Thursday.
49ers Defensive Line Faces Major Injury Problems
The Nick Bosa injury is the latest setback for a San Francisco defensive front that has already lost several players.
Defensive tackle CJ West was placed on injured reserve this week because of a knee injury. Defensive end Sam Okuayinonu and tackle Alfred Collins are also on IR after suffering practice injuries.
Rookie tackle James Thompson Jr. is dealing with a high ankle sprain and is expected to miss three to six weeks. Rookie edge rusher Romello Height has also been dealing with a broken hand and has not practiced this week.
Meanwhile, Mykel Williams remains on the physically unable to perform list while recovering from last season’s ACL injury. He could return to practice next week but is not eligible to play until Week 5.
Who Will Replace Nick Bosa?
With Bosa unavailable against Arizona, San Francisco is expected to rely on a much thinner defensive-end rotation.
The healthy options include Keion White, Khalid Kareem and Ogbo Okoronkwo. The 49ers will need those players to take on additional responsibilities while Bosa is sidelined.
Bosa’s absence is significant because he remains one of the central pieces of San Francisco’s pass rush. The defensive unit will now be tested without its leading edge presence as the team attempts to maintain its perfect 2-0 start.
49ers Face Cardinals in Week 3
San Francisco enters Sunday’s matchup against Arizona with a 2-0 record, but the Nick Bosa injury changes the outlook for the team’s defensive front.
The 49ers had hoped to showcase a rebuilt defensive line at home, but injuries have forced the coaching staff to reassess its personnel. Bosa’s eventual recovery timeline and the team’s decision regarding injured reserve will be closely watched in the coming days.
For now, Nick Bosa is expected to miss the Cardinals game, with his calf injury potentially keeping him out for multiple weeks.
Nick Bosa Injury: Key Points
- Nick Bosa suffered a calf injury during Thursday’s practice.
- He is expected to miss the 49ers’ Week 3 game against the Arizona Cardinals.
- The injury could keep Bosa out for multiple weeks.
- San Francisco is considering whether to place him on injured reserve.
- Bosa recently returned from a torn ACL suffered against Arizona last season.
- The 49ers are already dealing with several defensive-line injuries.
- Keion White, Khalid Kareem and Ogbo Okoronkwo are among the available edge options.
The latest Nick Bosa injury is another major challenge for San Francisco as the 49ers try to protect their unbeaten start and navigate a growing list of defensive injuries.
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