"We're going to start Shaun Hill at quarterback on Sunday, and then after that, we'll see what happens," Schwartz said.
Stafford was back at practice, but he stood to the side in his jersey and a baseball cap while Hill and Drew Stanton participated in drills during the portion of practice open to reporters.
Stafford was knocked out of the season opener when Chicago's Julius Peppers sacked him Sunday, putting the quarterback on the sideline with a banged-up right shoulder -- his third injury in two seasons. Stafford's father, John Stafford, said his son would visit well-known sports Dr. James Andrews this week.
"He's really frustrated but still upbeat," John Stafford told The Associated Press. "I know he's going to get over this hurdle."
Stafford missed six games last season after being the No. 1 pick in the draft because of a banged-up left shoulder and right knee. Hill took Stafford's place during last weekend's 19-14 loss to the Bears.
"Everybody plays this game to actually play it, not just to practice," Hill said. "So I'm very excited for the opportunity."
Schwartz said earlier in the week that he didn't believe Stafford would need surgery. Schwartz said Wednesday that not much had changed in the past couple days, but he wouldn't go into more detail.
"I'm not going to comment on what our doctors tell a player," Schwartz said. "I'm not going to comment on what results of an MRI are, or any of those things. That's just the way it is."
Detroit traded a seventh-round pick to San Francisco in March to acquire 30-year-old Hill.
"Obviously, the more experience you have in this league, the better off you're going to be, so that helps," Hill said.
"He doesn't have a long period of being inactive," Schwartz said. "He's a veteran quarterback -- he's been around a long time, he knows how to prepare, he knows how to be ready for those situations, he's been in that role before."
Copyright 2010 by The Associated Press