Heath (concussion) was placed on injured reserve Saturday, Josh Dubow of the Associated Press reports.

The 29-year-old was already ruled out for Sunday's matchup with the Colts, but he'll now be sidelined for at least the next three games. Heath will be eligible to return for Week 17, though it's unclear if he'll be healthy by that point. Erik Harris is expected to take over at free safety for the Raiders.

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