Bynes has an infected finger, which coach John Harbaugh said isn't serious.
McClellan has been not practicing during the week and then playing special teams on Sundays.
Canty was listed with a thigh injury.
Several players were limited, including cornerback Chykie Brown (hamstring), center Ryan Jensen (foot surgery), nose tackle Haloti Ngata (left elbow), outside linebacker Courtney Upshaw (foot) and cornerback Lardarius Webb (strained hamstring).
Ngata briefly left the game Sunday during a 19-17 loss to the Green Bay Packers before returning and finishing.
"It wasn't that bad," Ngata said. "It wasn't bad enough to keep me out."
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. I can go out and play and be the guy that I am instead of trying to hobble along and not give the team the best chance. Everybody has been great about it."
The Steelers ruled out wide receiver Markus Wheaton (finger).
Rookie linebacker Jarvis Jones didn't practice due to a head injury.