Lions head coach Jim Schwartz says that rookie quarterback Matt Stafford is day to day with a knee injury. "It's possible," Schwartz said Monday when asked if Stafford could play against the Steelers this coming weekend. Stafford's right knee was twisted on a sack in the fourth quarter of Sunday's loss against the Bears. He suffered a subluxation of his right knee in which his knee cap popped out of its normal position but popped back in.