Nick Bosa’s road back to the field has hit another setback, with the San Francisco 49ers monitoring tendonitis in his right knee. The pass rusher is still working back from last year’s ACL injury, making his latest issue worth watching closely.
San Francisco has time to be patient, but Bosa’s importance to the defense makes every update matter.
Donte Whitner Sends Clear Nick Bosa Warning to San Francisco
Former 49ers Pro Bowler Donte Whitner believes the team should take every possible precaution with Bosa rather than chase extra preseason reps. The defensive star is coming off his third career ACL reconstruction, and Whitner says the knee affects nearly every part of his pass-rushing game.
“I’m not panicking, but I’m definitely paying attention because for a pass rusher like Bosa, that knee affects everything that you do,” Whitner said on the “Grit Code Podcast.” “Your get off, your ability to bend the corner, your ability to plant, to counter inside.”
This matters because Bosa does not win simply by running straight at quarterbacks. His ability to explode off the snap, bend around offensive tackles, a nd change direction depends heavily on his lower body.
Even a small reduction in that explosiveness could affect how effectively he pressures opposing quarterbacks.
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Whitner believes the 49ers should have one priority right now, and that is to get Bosa ready for meaningful games without creating another problem.
“Could this just be the 49ers being smart? Absolutely,” Whitner said. “It’s August. There is zero reason to win a training camp rep and lose Nick Bosa for meaningful football.”
Nick Bosa’s knee isn’t panic time yet… but I’m watching it. 👀
Same knee. ACL reconstruction. Now irritation being managed week-to-week.
If it lingers into Week 1, concern gets real.
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📺 https://t.co/0FQejm7Nkm@DonteWhitner @rodbrooksTV pic.twitter.com/wLooIc4xYW— Grit Code Podcast (@thegritcode) August 13, 2026
This approach makes sense for a player coming off a major knee injury. San Francisco does not need Bosa to prove anything during the preseason, especially if managing his workload can help him enter the regular season healthier.
Still, Whitner does not view the current situation as something the 49ers can simply ignore. He pointed to specific signs that would make the tendinitis more concerning.
“Here’s where it becomes a concern,” Whitner said. “If that irritation lingers into Week 1, or if we start seeing him lose explosiveness off the edge, then this defense has a much bigger problem.”
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Bosa’s health could also influence how the entire defense operates, which ranked 20th last year in the PFN NFL Defense Impact Metric. If he cannot consistently generate pressure with the front four, San Francisco may have to ask its secondary to hold coverage for longer periods.
“Because if Bosa isn’t creating pressure, now you’re asking that secondary to cover longer,” Whitner continued. “And I’m not sure this secondary is built to live like that.”
Whitner made it clear that he is not predicting another major injury. However, Bosa’s history means the situation deserves close attention.
“I’m not sounding the alarm yet, but I am watching that knee closely,” Whitner said. “Same knee, franchise player coming off an ACL.”
That is why the 49ers have little to gain by rushing Bosa back.
A few extra August reps mean very little compared with having their premier pass rusher healthy when the games actually count.
