Lions safety Mike Killebrew in concussion protocol

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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.