Matthew Stafford didn't leave the locker room immediately as the second half got underway in Chicago. As a result, Shaun Hill took over as quarterback of the Lions. His first drive was a three and out for Detroit.
The official word from the Lions is that Stafford's return to the game is questionable. He just recently emerged from the locker room with an enormous wrap on his shoulder, however, so I highly doubt he will be back anytime today.
The concern now becomes how banged up Stafford is, as his long-term future could be in doubt with a potentially severe injury to his throwing shoulder.