Reggie Bush was supposed to have his biggest game-day role since joining the 49ers. Instead, the veteran running back slipped on the concrete slab that rings the field inside the Edward Jones Dome on Sunday and may be lost for the season.
Two national reports said the 49ers fear Bush tore his left ACL on the play, which occurred in the first quarter. Bush said he didn’t want to speculate and that he’d have an MRI in the Bay Area.
“I’m not a doctor; I’m not going to try to be one tomorrow,” he said. “We’ll find out (Monday).”
It’s the second straight week an opposing player has slipped on the concrete. Cleveland quarterback Josh McCown had a similar fall Oct. 25 after running out of bounds, sliding on the concrete and hitting his elbow and shoulder on the wall that separates the field from the stands.
Bush said he also crashed into the wall after stepping on the concrete. He was running from one sideline to another on a punt return and seemed to get an extra shove from a Rams defender as he was going out of bounds.
The turf from the field extends another 10 yards or so out of bounds. But then it gives way to concrete.
“Am I angry that I slipped and fell? Yes,” Bush said.
The 49ers started the game without Carlos Hyde, who has a stress fracture in his left foot. That meant Bush, 30, was going to have a big role Sunday, and he was on the field for six of the 49ers’ first eight snaps. They also lost rookie runner Mike Davis to a hand injury in the second quarter.
San Francisco coach Jim Tomsula said that if Davis broke his hand, the 49ers will add a runner to the roster. Possibilities include Jarryd Hayne, who was released Saturday but who must pass through waivers Monday, and veteran Pierre Thomas, whom the 49ers worked out last month.
Asked why Hayne was released, Tomsula said the 49ers wanted a heavier runner for the Rams game. Kendall Gaskins, who finished the game as the 49ers’ only healthy tailback, is listed at 238 pounds. Gaskins finished with five carries for six yards.
“Jarryd Hayne has done everything we’ve asked him to do,” Tomsula said. “I made the decision to bring up a power back for the game. We only have 53 spots, and I made that decision.”
Boldin sits; Simpson plays –Anquan Boldin’s consecutive games streak ended at 46. The veteran wide receiver has been dealing with what the team has described as a hamstring strain, which he exacerbated Thursday. He did not practice Thursday or Friday and was declared inactive for the Rams game.
With Boldin out, Jerome Simpson played for the first time since the 2013 season when he was with the Vikings. Simpson was targeted 10 times Sunday, catching three passes for a team-high 34 yards.
Trade deadline – The NFL’s trade deadline is Tuesday at 1 p.m., and the 49ers, who are clearly in rebuilding mode, reportedly are willing to make a deal.
One of the names mentioned most is that of tight end Vernon Davis, who hasn’t scored a touchdown since Week 1 of the 2014 season and who is entering the final year of his contract.
“It’s a possibility; you know there’s nothing I can do about it,” said Davis, 31. “ ... I’m a positive believer. I believe everything works its way out for the good for those who are good people. But I’m always prepared for anything. Nothing new surprises me.”
Davis said he hasn’t spoken with general manager Trent Baalke about his future but has spoken with his agent.
Baalke said he hasn’t received a lot of trade offers but that discussion typically heats up on the eve of the trade deadline.
Davis had six catches for 24 yards Sunday.
Change of events – Outside linebacker Ahmad Brooks, who led the 49ers in their pregame huddle, seemed to make a potentially momentum-changing play in the third quarter when he scooped up a Rams fumble and rumbled 41 yards for touchdown.
It would have been the 49ers’ first defensive touchdown of the year. Instead, there was a penalty.
Brooks was flagged for grabbing the face mask of running back Benny Cunningham when the ball was loose, which erased the touchdown and gave the ball back to St. Louis. The Rams attempted a 40-yard field goal, but it was blocked by Quinton Dial.
“I knew that I hit him in the face mask,” Brooks said. “I knew that when I reached the end zone it could potentially be called back. But obviously it wasn’t intentional for me to do that. But I was fighting for the ball. ... I guess I grazed his face mask. But I didn’t pull it.”
Referee Jerome Boger’s crew called 25 penalties, 13 against the 49ers.
Injuries – In addition to those listed above, safety L.J. McCray suffered a knee injury and didn’t return, tight end Garrett Celek had a concussion, punter Bradley Pinion strained his calf, cornerback Kenneth Acker is dealing with sore ribs, and cornerback Keith Reaser sprained his ankle.