By C.J. Peterson
Special to S.F. Examiner
SANTA CLARA, Calif. — The 49ers have announced on Friday that running back Raheem Mostert will be placed on season-ending injury reserve after sustaining a broken right arm during Thursday night’s 34-3 win over the Oakland Raiders at Levi’s Stadium.
“He’s going to have surgery today,” 49ers head coach Kyle Shanahan said on Friday afternoon. “I wasn’t told how long it’ll be. I know he’s going on IR, so he’s out for the year.”
Before the the gruesome injury, Mostert was off to the best start of his young career. On seven carries through only two-and-a-half quarters of play, Mostert had gained 86 yards — one yard shy of the career-high he posted in Week 6 at Lambeau Field in Green Bay.
On Thursday night, the Purdue product also found the end zone for the first time since entering the league as an undrafted free agent in 2015.
On the second drive of the third quarter, Mostert hit the right sideline on a outside-zone rush that would go for 52-yards and a score after zig-zagging his way to the goal line behind rookie right tackle Mike McGlinchey, who ran with Mostert the whole way down field.
“I don’t know too many plays that come to mind where I’ve had to do that,” McGlinchey said after the game. “It was a fun one for sure until I had to get over to the sideline and catch my breath.”
The fun didn’t last long for Mostert and Co., as five minutes later, the 26-year old ball-carrier would be writhing in pain on the field while his teammates frantically waived over the 49ers medical staff.
Taking a routine handoff in the backfield on third-and-1 at the 49ers’ 29-yard line, Mostert was tripped up behind the line of scrimmage. In an attempt to brace himself for the fall, Mostert extended his right arm.
Taking the entire weight of his 195-pound frame, Mostert’s right forearm snapped under the pressure, bending at a 90-degree angle — the upper body rendition of the infamous Joe Theismann injury in 1985.
As the 49ers medical staff tended to the injured Mostert, both his San Francisco teammates and Oakland competitors kneeled around him in prayer.
Mostert was able to walk to the 49ers locker room under his own power but with an air cast wrapped around his very-broken right arm.
“I’m sure he’ll be fine by next year,” Shanahan said. “Broken bone, different than ligaments and things like that.”
As for who will replace Mostert on the roster, considering his role as the team’s second option at running back behind Matt Breida, Shanahan says the 49ers will look into their practice squad roster for internal promotion.
“We haven’t decided yet. I know we have two good options on the practice squad,” he said. “We possibly could bring in some more guys to work out. We’ve got some extra days with the Thursday night game, so we’ve got a few days to decide on that.”
In addition to Mostert, the 49ers also announced that rookie cornerback Emmanuel Moseley, who was promoted from the practice squad ahead of Thursday night’s game will also be placed on season-ending injury reserve.
According to Shanahan, Moseley sustained a dislocated shoulder that will also require surgery to repair. Said surgery will take place on Tuesday, per Shanahan. With Moseley and Mostert on IR, the team re-signed quarterback Tom Savage, who they waived before Thursday night’s game when it was determined C.J. Beathard was healthy enough to back up Nick Mullens.