Bears general manager Jerry Angelo said after the game that Harris is healthy.
"It's all about getting the best rotation up, and we wanted to look at some other guys," Angelo said. "It was a coach's decision."
Asked if Harris is injured, Angelo said: "No, it was a coach's decision."
Harris only has one tackle, two quarterback hits and one fumble recovery this season. The Bears are desperately looking for someone other than Julius Peppers to provide consistent pressure on the defensive line.
Harris didn't have much to say after the game.
"See you on Wednesday," Harris told reporters. "You'll have to ask the coaches about that."
Asked if he was upset by sitting out, Harris said: "No, not at all. We won."
Coach Lovie Smith insisted the reasons were simply related to performance and not health or discipline.
"Tommie has been doing everything that we've asked him to do," Smith said. "We have decisions. [Receiver] Devin Aromashodu didn't dress tonight. We have good players on the sideline right now. It was a one-game situation. We'll go back to practice next week and see who gives us the best chance to win then."
A three-time Pro Bowl pick, Harris was benched for a game last season and suspended for one in 2008 because of detrimental conduct. He has also been limited by knee and hamstring injuries over the past four years, although he was not listed on the Bears' injury report leading up to Monday's game.
"Just Tommie's presence alone makes a big difference," Toeaina said. "We definitely missed him out there. We're not sure what is going to happen this week, but if anything, we got to be ready for whatever the rotation is going to be."
Aromashodu was also inactive, one week after only playing one snap against the Cowboys.
"No, I wasn't surprised," Aromashodu said. "I kind of knew there was a chance of that happening."
Aromashodu led the Bears in targets in the Week 1 victory over Detroit, but hasn't been able to get on the field since.
"Just keep working," Aromashodu said when asked what he can do. "That's the only thing you can do, just keep working. Eventually, the opportunity will present itself and I just got to be ready."
Jeff Dickerson covers the Bears for ESPNChicago.com and ESPN 1000. Information from the Associated Press was used in this report.