The Lions were already thin in the secondary, now will be without another safety this week.
According to Kyle Meinke of MLive.com, safety Miles Killebrew suffered a concussion in practice Thursday.
That doesn’t leave much time for clearance through the concussion protocol, so he’s likely out against the Bears.
Killebrew was a former safety who was moved to linebacker, but the Lions moved him back to safety.
They traded Quandre Diggs to the Seahawks, then fellow starter Tracy Walker suffered a knee injury and hasn’t practiced this week, taking both of their starters out of the mix.
That leaves Will Harris, Tavon Wilson, and C.J. Moore at the position.