The Steelers didn't practice Monday, but Roethlisberger worked out on his own and didn't have any problems, Tomlin said.
"All indications are he'll be a full participant tomorrow (Wednesday) in practice and ultimately play in the game on Sunday," Tomlin said Tuesday.
If the headaches should unexpectedly return, Tomlin said the Steelers will "act quickly" with Roethlisberger.
The two-time Super Bowl-winning quarterback sustained his fourth concussion since 2006 and his second in less than a year during an overtime loss in Kansas City on Nov. 22. Neither Roethlisberger nor the Steelers revealed during the week that he was having headaches, one reason there was considerable surprise when it was announced he wouldn't play against the Ravens.
"There are codes that come with playing tough games like football that kind of conflict at times, with things that are of utmost importance like head injuries," Tomlin said. "I understand the gravity of the decision that we had to make on Saturday, the potential of that.
"I understand that if we allowed Ben to play that we'd be open to questions in regards to that. I thought that if we didn't allow Ben to play, that we'd be open to questions in regards to that. Really, it was irrelevant in terms of my decision making. I was more concerned about doing what was right. Medical experts suggested he not play, so we didn't play him."
Copyright 2009 by The Associated Press