The Cincy Enquirer says that despite hurting, it looks like Tank Johnson will go vs the Ravens:

Bengals DT Tank Johnson has plantar fasciitis in his foot but says he expects to play after missing the Cleveland game. “I made a big improvement from Week 1 to this week. The training staff is doing a good job of getting me right, and I expect to go,” Johnson said. “It’s something that you have to push through, but something I’m willing to do for the team. There’s a lot of guys hurting. It’s not much about the pain; it’s whether I’m able to go.”