Hyde tested negative, head coach Jim Tomsula said. The second-year running back returned to the sideline late in the second half, but did not re-enter the game.
"He was cleared (to return), but (I) opted not to put him back in. That was me," Tomsula said.
Hyde said: "I got hit on the crown of my head. I was kind of dizzy when I got up, but I was good once I got to the sideline. The concussion test, I passed that. I was good to go, but coach (Tom) Rathman pulled me." Hyde said the hit in question came from linebacker Lawrence Timmons.
Hyde came into the game as the NFL's leading rusher after Week 1, when he scored two touchdowns while running for 168 yards against the Minnesota Vikings. He left Sunday's game with 43 yards rushing on 14 carries, adding 18 yards on four catches with the 49ers down 29-3.
The 49ers tried to get the running game going early, as they did against the Vikings, but didn't have much luck. His 3.07-yard average per carry was less than half his 6.5-yard average from the opener.
"I think they did a good job defensively. When it came it running the ball, they had a good scheme," Hyde said. "They were ready for us. It’s definitely good film to watch this week."
Hyde's former Ohio State teammate and fellow member of last year's draft class Ryan Shazier finished with a game-high 15 tackles, including three for loss. The Steelers took Shazier with the 15th-overall pick 2014.
"Ryan actually told me, ‘Yeah, we’re going to lock in on you,’" Hyde said. "They did that. But you got to get used to that, though."
Rookie running back Mike Davis, making his NFL debut, replaced Hyde, and was unable to get into the end zone on three rushes coming inside the 3-yard line. The 49ers were unable to score on the third-quarter drive, turning it over on downs to Pittsburgh ending the 18-play series.
Chris Biderman is the Editor-in-Chief of Niners Digest and covers the 49ers from their headquarters in Santa Clara. Chris has been writing about the team since the spring of 2013. The Ohio State alum received his Journalism degree in 2011 and has been working in sports media since 2008. Chris, a Santa Rosa, Calif. native, is also a contributor to the Associated Press covering sports throughout the Bay Area. You can follow Chris on Twitter here.
E-mail Niners Digest: NinersDigest@gmail.com