Butt (knee) has been placed on injured reserve, Adam Schefter of ESPN.com reports.

Since joining the league last season, Butt has already suffered two torn ACLs -- last season in his right knee and now in his left. In a corresponding move, the Broncos added tight end Brian Parker to their active roster from the practice squad. Look for Jeff Heuerman to see increased snaps with Butt now out.

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