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Jackson (concussion) has been suspended for four games by the NFL for violating the NFL's policy on performance enhancing substances, Zak Keefer of the Indianapolis Star reports.

Jackson's suspension is a big blow as he's one of Indy's best players on a defense that's struggled at the linebacker position. He'll miss the rest of the regular season but could return for the playoffs. He's currently in the concussion protocol, so he'll have four weeks to recover from that injury if the Colts make the postseason.

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