And while he passed the test, he was not put back into the game.
“That was my call,” 49ers coach Jim Tomsula said.
The game was out of hand by the time Hyde went into the locker room for the evaluation.
“I got hit on the crown of my helmet, so I was dizzy when I got up,” said Hyde, who finished with 43 yards on 14 carries (he also lost a fumble on an exchange in the shotgun with quarterback Colin Kaepernick) a week after his Monday Night Football star turn with 168 yards rushing.
“I felt better when I got to the sideline. The concussion test, I passed that and I was ready to go but they pulled me.”
Hyde took a beating all game long, because even before Steelers safety Mike Mitchell caught him with the helmet shot, he sent Hyde to the sidelines in the first half with a leg tackle.
The 49ers rushed for 111 yards as a team, with Kaepernick the leading ground gainer at 51 yards. Rookie Mike Davis added 14 yards on seven carries while Australian rugby league convert Jarryd Hayne had three yards on two attempts.
And Hyde had an inkling the Steelers would be keying on him. A former college teammate told him as much.
“We’re going to lock onto you,” linebacker and fellow Ohio State product Ryan Shazier told Hyde.
“They did that ... [so I’ve] got to get used to that, though.”
These things happen to No. 1 running backs.