"Lions coach Jim Schwartz gave no indication Tuesday who'll be his starting quarterback Sunday at San Francisco. But he did acknowledge it "most likely" won't be rookie Matthew Stafford, who remains sidelined with a left shoulder injury.

"But he is improving," Schwartz said of Stafford.

As for the decision between veteran Daunte Culpepper and Drew Stanton, hoping to make his first NFL start, Schwartz played coy again. He'll likely reveal his plans today when the Lions return to practice.

"There's a lot of things that go into it," Schwartz said. "Game plans and defense and offense and the way we're going to do things and production, where we've been the last few games. All those things go into it.""