The Denver Broncos are down to the NFL roster limit of 75 players.

The Broncos placed safety Quinton Carter on injured reserve with a knee injury.

Center J.D. Walton was placed on the reserve-physically unable to perform list.

Walton will miss at least the first six games after undergoing ankle surgery..

"It's always tough," wide receiver Eric Decker said. "I'm going into my fourth year. You build a relationship with everybody in this locker room. To see a guy go, whether it's moving to a different team or getting cut in general, it's always tough."

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Aaron Wilson covers the Ravens for The Baltimore Sun.