The Cleveland Browns placed nose tackle Phil Taylor on injured reserve due to a knee injury that will require surgery.
The Browns rank 28th in rushing defense.
Taylor's injury goes along with tight end Jordan Cameron being out indefinitely with a concussion.
"You don't know," Pettine said. "It's a touchy subject."
The Browns replaced Taylor on the active roster by promoting linebacker Keith Pough from the practice squad.
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Aaron Wilson covers the Ravens for The Baltimore Sun