Arnette (concussion) has been ruled out for Sunday's game against the Colts, Paul Gutierrez of ESPN.com reports.

Arnette suffered a concussion in Week 12, then aggravated the injury on the Raiders' second defensive play against the Jets. He'll need to clear the league's five-step concussion protocol before his team's Week 15 matchup against the Chargers to be eligible to play. That could be difficult with the game taking place Thursday.

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