Lions' Flowers, Ragnow suffer head injuries

Detroit Lions defensive end Trey Flowers and center Frank Ragnow are in the NFL concussion protocol, stemming from head injuries suffered during Sunday's loss to the Dallas Cowboys. Both players left during the fourth quarter. Flowers had suffered a leg injury earlier in the contest but returned before leaving for good later.

Safety Tracy Walker also went down with a knee injury. He was playing for the first time since being hurt Oct. 27 against the New York Giants. Lions coach Matt Patricia didn't know if Walker's injury was a new one or an aggravation of the recent ailment.

"We had done a couple of things with him through the course of the week and just really saw everything look normal from a physical standpoint," Patricia said afterward. "So had a couple packages that we thought would be good for him to be in." Punt returner Jamal Agnew (ankle) and fullback Nick Bawden (knee) also departed with injuries.

Detroit also played without quarterback Matthew Stafford (back) for the second straight game. An ESPN report says Stafford could miss another month due to fractured bones. The Lions (3-6-1) have lost three straight games and six of their past seven.

(This story has not been edited by Devdiscourse staff and is auto-generated from a syndicated feed.)