The Detroit Lions won't take any chances with the health of strong safety Amari Spievey.
The team placed Spievey on season-ending injured reserve Saturday as he continues to deal with concussion issues, according to DetroitLions.com. Spievey has been replaced on the 53-man roster by cornerback Drayton Florence, who was activated off short-term injured reserve.
Spievey suffered a concussion in Week 7 against the Chicago Bears and is still experiencing lingering effects nearly a month later. He was never cleared for contact after sustaining the injury.
The Lions announced earlier this month that running back Jahvid Best will remain on the reserve physically unable to perform list for the rest of the season as he continues to recover from two concussions suffered last season.
Florence could start at right cornerback against the Green Bay Packers on Sunday, according to the team's website.
"He's an exceptional veteran player," defensive coordinator Gunther Cunningham said Friday. "He's like a lot of the older guys I've had. He learned to study the game a long time ago. I really like the way he's moved in practice and he's going to get a big load. How much I can't tell you right now, but we expect him to play and play well."
Florence will face a tall challenge against a Packers wide-receiving unit that should have Jordy Nelson back on the field.
Follow Dan Hanzus on Twitter @danhanzus.
