49ers Face Big Challenge Without Nick Bosa

The 49ers have suffered a significant blow when Nick Bosa injured his calf during practice, leaving the team without a key pass rusher for the upcoming game against the Cardinals. This injury compounds a season already riddled with defensive line injuries, raising questions about the team's depth a…

By Felo News Desk · Published Sat, 26 Sep 2026 01:02:20 GMT

The San Francisco 49ers entered the season with high expectations, but a string of injuries has already threatened their chances of making a deep playoff run. The latest setback came on Thursday when star edge rusher Nick Bosa pulled his calf during a high‑knees drill in practice. The injury will keep him out of the game against the Arizona Cardinals on Sunday and could sideline him for several weeks, according to head coach Kyle Shanahan.

What Happened?

Bosa was warming up individually before a full‑team walkthrough when he felt a sharp pain in his calf. He was immediately taken to the locker room for evaluation. The team’s medical staff determined that he would miss a few weeks of action, but the 49ers chose to keep him on the active roster for the time being. The injury is the latest in a long list of defensive line problems that have plagued the team this season.

Background: A Season of Attrition

The 49ers began the year with a promising start, winning their first two games by 20 points or more. Those victories fueled hopes of a strong playoff push. However, the defensive line has been decimated by injuries to key players: C.J. West (bone chips in the knee), Sam Okuayinonu (broken foot), Alfred Collins (torn patellar tendon), and James Thompson Jr. (ankle sprain). Rookie edge rusher Romello Height was also ruled out with a broken hand. With Bosa’s calf injury, the team now faces a defensive front that has lost six of its ten starters in the last two weeks.

The 49ers’ injury list is already crowded. They have seven players on injured reserve (IR) that they hope to activate, plus Bosa and two others dealing with high‑ankle sprains. The league allows only eight IR spots for players designated to return, putting the 49ers in a precarious position where they risk running out of roster space for returning players.

Impact on the Team’s Playbook

Nick Bosa is a five‑time Pro Bowler and the 2022 Defensive Player of the Year. He is the team’s primary pass‑rushing threat, and his absence forces the 49ers to rely on a less experienced front. The defensive line’s pressure rate, which was already the fifth‑best in the league at 31.6%, is expected to drop further without Bosa’s presence. Kyle Shanahan acknowledged that losing Bosa “was rough” and that the team will need to step up to fill the void.

In addition to Bosa, the 49ers have had to contend with the absence of Mykel Williams, who is not cleared to play until at least Week 5. The team has already signed defensive tackle Naquan Jones from the Vikings’ practice squad and is in talks with free agent Leonard Floyd. However, the front‑line depth remains a concern, especially with the Cardinals’ aggressive offensive line and the Cardinals’ own defensive challenges.

Looking Ahead: What’s Next?

Despite the setbacks, the 49ers remain optimistic. Shanahan emphasized that Bosa is expected to return this season, unlike last year when he missed significant time. The team’s coaching staff is working on a game plan that leverages the strengths of the remaining defensive linemen and the secondary. The 49ers also have a few players on their practice squad who could be elevated if needed.

In the broader context, the 49ers’ injury woes echo last season’s struggles, when Bosa tore his ACL in Week 3 and the team finished with only 20 sacks, the fewest in the NFL. The organization has not made major changes to address the defensive line’s fragility, instead relying on the return of Bosa and Williams from knee surgeries. Whether this strategy will pay off remains to be seen.

As the season progresses, the 49ers will need to navigate a roster that is already stretched thin. The team’s ability to adapt and find replacements for injured players will be crucial to maintaining their playoff aspirations.

Key facts

• Nick Bosa injured calf during practice, missing upcoming game
• 49ers already have seven players on injured reserve
• Defensive line has lost six of ten starters in two weeks
• Team has signed Naquan Jones and is exploring free‑agent options
• Coaches remain optimistic about Bosa’s return this season

Why it matters

Nick Bosa’s injury threatens to derail the 49ers’ defensive strategy at a time when depth is already thin, potentially jeopardizing their playoff ambitions.

Frequently asked questions

How long will Nick Bosa be out?

Kyle Shanahan said Bosa will miss a few weeks, but the exact duration is uncertain.

How many injured reserve spots does a team have?

Teams are allotted eight spots for players designated to return.

What is the 49ers’ next game?

They face the Arizona Cardinals on Sunday.

Sources

• [1] nypost.com — originally reported as “49ers have been able to withstand injuries so far — but not Nick Bosa’s”