"Lions coach Jim Schwartz on Monday could not definitively say whether or not he expects running back Jahvid Best to be back after the bye week.

Best missed his second straight game Sunday after incurring a second concussion in three months against the 49ers.

"We'll see," Schwartz said. "You can't have a timetable on these things. We've gone through it with Justin Durant and Tony Scheffler. Some come back quickly and some last longer.""