Mostert suffered a broken right forearm in the third quarter of Thursday night's 34-3 win over the Oakland Raiders and. Shanahan said Mostert would undergo surgery Friday then be placed on injured reserve. And, according to the coach, the injury could be worse than just the broken bone.
"I wasn't told how long [the recovery] would be," Shanahan told reporters. "I know he's going on IR. He's out for the year but I'm sure he'll be fine by next year. It's a broken bone, different ligaments, and things like that."
With 4:38 remaining in the third quarter, Mostert suffered the injury on a rushing attempt for no gain when he was met with force by Raiders defensive tackle Clinton McDonald. 49ers medical personnel rushed on the field after the play, having spotted the gruesome injury from the sideline.
Mostert had a 52-yard touchdown run and finished the game with seven carries for 86 yards. He's averaging 7.7 yards per carry in 2018.
The 49ers lost their original starting running back, Jerrick McKinnon, to a torn ACL before the season began. Matt Breida, another breakout back, has been hobbled by a variety of injuries throughout the season. The only other running back currently on the roster is veteran Alfred Morris.
--Field Level Media
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