ALLEN PARK -- The Detroit Lions will be without center Travis Swanson when the host they Bears in a rare Saturday game at Ford Field, and could be without another offensive lineman as well.

Swanson missed a third straight practice Thursday while recovering from a concussion, which means he won't be able to clear protocol in time for the game. One of the final steps of the program is practicing with contact, and the Lions don't have any full practices left.

Left guard Graham Glasgow is expected to slide over and replace Swanson at center, as he's done twice before. It's the position he was drafted to play anyway, and he has done it well in spot duty this year -- in fact, he has played better than Swanson.

Where the Lions will really feel the injury is back at left guard. Corey Robinson has been Glasgow's replacement this year, but he's probably going to have to start at right tackle because Rick Wagner has missed two full weeks of practice with an ankle injury.

That means either Joe Dahl, who just returned from injured reserve, or Don Barclay is expected to start at left guard. They combine for 34 snaps played this year, and neither has started.

In good news, the Lions got back guard T.J. Lang (foot), cornerback Nevin Lawson (illness) and receiver TJ Jones (family emergency) at practice on Thursday. All are expected to be available against the Bears.