The status of Lions running back Jahvid Best is unsure with the team heading into their bye week.
He missed his second straight game Sunday after incurring a second concussion in three months against the 49ers.
On Monday, coach Jim Schwartz couldn't definitively say whether or not he expected Best to be back after the bye week.
"We'll see," he 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."
"The one thing we will be sure to do is be objective and listen to the people who are the experts in these decisions," Schwartz said. "Like I've said a hundred times, it's not something you can put tape on or tough out. We have to be conservative."
When asked if there was a point where he'd consider putting Best on injured reserve, Schwartz again deferred.
"That would be listening to the people who know more about these things than me," he said. "You evaluate every player on a week-by-week basis."