Bynes didn’t practice due to an infected finger that hospitalized him Tuesday night, but he is expected back soon.
“He got good news,” Harbaugh said. “It’s clearing up.”
Backup nose tackle Terrence Cody returned to practice from a sprained left knee sustained against the Houston Texans and was limited.
Defensive end Chris Canty (groin) and inside linebacker Albert McClellan (sprained right shoulder) didn’t practice.
Nose tackle Haloti Ngata (left elbow), cornerback Chykie Brown (hamstring), center Ryan Jensen (foot surgery), outside linebacker Courtney Upshaw (foot) and cornerback Lardarius Webb (strained hamstring) were limited.
Ngata briefly left the game Sunday during a 19-17 loss to the Green Bay Packers.
“It wasn't bad enough to keep me out,” Ngata said.
Defensive end Marcus Spears (knee) and wide receiver Brandon Stokley (hip, groin) participated fully.
"Man, I feel pretty good," said Spears, who has been out the past two games. "I think the way we went about it was real smart.”
Blocking it out
New left tackle Eugene Monroe’s starting debut was marred when he surrendered a sack and forced fumble to Packers outside linebacker Nick Perry.
The blocking miscue led to a Packers field goal at the end of the first half.
“You always want to play a clean game and not get the quarterback touched,” Monroe said. “You have to be the guy who doesn’t let that happen.”
Although the Steelers have only seven sacks this season led by outside linebacker LaMarr Woodley’s four sacks, they're known for unpredictable pass rush schemes designed by the architect of the zone blitz: veteran defensive coordinator Dick LeBeau.
“Every team has their way of attacking an offense, and his way may be different than any other way,” Monroe said. “We’ll prepare and be ready.”
Running back auditioned
The Ravens worked out former Cincinnati Bengals running back Bernard Scott, according to a league source.
He wasn't immediately signed to a contract, though.
Scott, 29, hasn't played this season since being released by the Bengals. Last year, he played in two games Cincinnati and rushed for 35 yards on eight carries with a knee injury shortening his season.
In four NFL seasons, Scott has rushed for 1,035 yards and four touchdowns. He's caught 29 passes for 165 yards.
The Ravens' running game has struggled, but it's unclear if Scott would provide an upgrade. The Ravens have only two running backs on the active roster: Ray Rice and Bernard Pierce.
The Ravens converted only 2 of 14 third downs against the Packers and had eight three-and-out drives ending in Sam Koch punts. “The trend is that we’re not doing very well on first down, and we’re not doing very well on second down,” Harbaugh said. “We are putting ourselves in very long third-down situations. That’s made it very difficult.” … The Steelers ruled out wide receiver Markus Wheaton (finger) and rookie linebacker Jarvis Jones didn't practice due to a head injury. That's probably a concussion even though the Steelers made no official announcement of the nature of Jones' injury.