* DE Aaron Smith won't play.
* SS Troy Polamalu didn't practice and wouldn't provide any clues as to whether he'll play.
* TE Heath Miller probably will play.
* LT Jonathan Scott will play.
"I should be good," said Scott, who added that he returned to work as the starting left tackle, a position that had been under apparent scrutiny by Steelers coach Mike Tomlin.
Miller practiced, and felt good afterward, but he was in the same situation last week and didn't play.
After suffering a concussion against the Baltimore Ravens, and missing the following game, Miller practiced last week, but then endured headaches and had to sit out the game against the New York Jets.
"I'm feeling good," Miller said after Tuesday's practice. "We'll take it day by day and see what happens Thursday. I'd like to say I'm playing, but I'm going to stick to the plan."
Miller at least provided more information than did Polamalu. Here's an exchange with him after he missed another practice with a lower leg injury:
Q: "What's the injury?"
A: "I don't know what the injury is. All the injury questions are for coach Tomlin. He knows more about my body than I do."
Q: "What do you think about Thursday?"
A: "I would look forward to playing on Thursday."
Q: "Do you think you will?"
A: "Honestly, that's on coach Tomlin. He doesn't want us to comment on injuries or game-planning and whatnot."
Last week, several national media outlets reported that Polamalu might miss the rest of the regular season.
"I don't know where they would get that information," he said. Smith, the defensive end who's been out with a partially torn triceps since Week 7, also made an appearance in the locker room. He's been lifting weights for over a week but couldn't provide any kind of progress report.
"I don't know. I don't have any percentages for you," he said. "When you first start you can't just come back and start doing it. The muscle hasn't done anything. Even if I hadn't injured it and didn't lift in five weeks, I wouldn't be able to come back and throw on the weight I was doing before.
"I don't have a timeline, to be honest with you. I'm just day to day, really. The scans and indications and stuff like that will be a big part of what goes on."
Smith will undergo another MRI next week and hopes to have a better understanding of his situation.
Of course, the Steelers have held open a roster spot for Smith in the hope he can return for the playoffs.
"To believe you could possibly get a chance and come back and be a part of something is very special. I can't say how appreciative I am about it," Smith said.
Special-teamer Arnaz Battle also missed Tuesday's practice with a chest injury.