Just as things were heating up in 49ers training camp, a sudden scare may have sent shockwaves through the defensive room: standout cornerback Renardo Green left Friday’s practice early with what appears to be a hamstring injury—and the implications could be massive.

Brock Purdy Out, Mac Jones In — and Then the Unexpected

Friday marked the final session of the 49ers’ first training camp block. Starting quarterback Brock Purdy was excused due to a personal matter, leaving backup Mac Jones in charge. And while Jones had his ups (including a flashy reverse block) and downs (like an early pick to Ji’Ayir Brown), all eyes quickly turned to a far more alarming moment on the sideline.

The Play That Stopped Everything

During a deep pass along the sideline, wide receiver Jauan Jennings—who returned to practice in fiery form—was tightly covered by rookie cornerback Renardo Green. Green made a great play to break up the pass… but then something went wrong.

According to reporters on-site, Green walked off the field gingerly and didn’t return. He was seen stretching his hamstring, signaling a likely soft tissue injury.

This wasn’t just any player going down.

 Why Renardo Green’s Injury Could Be a Big Deal

Green has been pegged by many insiders as one of the top three most important players on the 49ers’ defense in 2025. His size, instincts, and athleticism have allowed defensive coordinator Robert Saleh to design more aggressive schemes.

“If Green ascends to that All-Pro level, it unlocks everything else for this defense,” one team analyst noted.

And let’s not forget: Elite cornerback play has been a key ingredient in the 49ers’ most dominant defensive years. If Green misses extended time, the burden shifts onto Deommodore Lenoir, whose frame and style offer a different skill set.

Practice Drama: Fights, Absences, and More

• Jauan Jennings and Deommodore Lenoir exchanged punches in a heated moment—proof that intensity is already at midseason level.

• Jacob Cowing, another wide receiver, was also absent for unknown reasons.

• Saturday is a scheduled off-day, with the team expected to resume training Sunday.

Could This Derail the 49ers’ Defensive Plans?

With Green’s health suddenly in question, fans and coaches alike are holding their breath. Hamstring injuries can linger—and the 49ers cannot afford to lose a rising cornerstone in the secondary before the season even begins.