Oakland Raiders middle linebacker Nick Roach is out for the season.
He was placed on injured reserve with a concussion.
Roach, 29, recorded 112 tackles and 5.5 sacks last season.
The Raiders replaced him on the roster with linebacker Jamar Chaney.
Chaney has played for the Denver Broncos, Philadelphia Eagles and Atlanta Falcons.
Chaney has 158 career tackles.
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Aaron Wilson covers the Ravens for The Baltimore Sun
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