Arizona Cardinals placed linebacker John Abraham on season-ending injured reserve because of concussions,
Abraham did not pass the league’s mandated concussion protocol after suffering a head injury in the Cardinals’ Week 1 victory over the San Diego Chargers. He left the team briefly, which allowed the Cardinals to use a temporary roster exemption.
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The team also re-signed punter Drew Butler, who was released to make room for Abraham on the roster.
Abraham is a five-time Pro Bowler and has 133.5 career sacks, which leads all active players.
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