San Francisco 49ers running back Jerick McKinnon (28) runs between Dallas Cowboys defensive end Tyrone Crawford (98) and cornerback Byron Jones (31) during the first half of an NFL preseason football game in Santa Clara, Calif., Thursday, Aug. 9, 2018. (AP Photo/Tony Avelar)Tony Avelar/Associated Press

Jerick McKinnon's Knee Injury Reportedly Diagnosed as Torn ACL; Out for Season

Alec Nathan

Sep 1, 2018

San Francisco 49ers running back Jerick McKinnon reportedly suffered a season-ending torn ACL Saturday, per Ian Rapoport of NFL Network.

He sustained the knee injury while making a cut at 49ers practice Saturday, per Nick Wagoner of ESPN.

"Something with a knee, we'll find out later," 49ers head coach Kyle Shanahan said before the diagnosis, per Wagoner. "We're nervous about it, that's for sure."

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The 26-year-old previously gave the 49ers a scare when he suffered a knee injury late in training camp that required an MRI. Ultimately, the scans revealed a muscle strain, and he was given the all-clear to return to the field following some cautious maintenance work by the coaching and medical staffs.

Since then, San Francisco's $30 million man has been trying to work his way back to full strength in hopes of getting ready for a Week 1 tilt against the Minnesota Vikings.

The 49ers don't have another bona fide three-down back, so it will likely be up to Matt Breida and free-agent signee Alfred Morris to split the workload with McKinnon out.