Bucs guard Arron Sears did not practice Thursday and the team believes he has a mild concussion.

Sears also was limited in practice Wednesday for what the team listed as a back injury. Coach Jon Gruden said he did not believe the injury was very serious. He expects Sears to play Sunday at Kansas City.

"I don't believe it is (serious), but I am one of those coaches that believes you've got to practice to play,'' Gruden said.

"I think it might be a mild concussion. Again, I don't think it's real serious. We don't seem to have that much concern but we'll see how he is later today and into tomorrow.''

Gruden said Sears was injured in practice Wednesday, but the team participated in more of a walk-through workout without helmets or shoulder pads.

Running back Warrick Dunn missed the second straight of practice Thursday with a pinched nerve in his back. "Right now,  we don't feel like he's ready to go. We'll see where he is tomorrow.''