They worked out former Atlanta Falcons defensive tackle Trey Lewis, a former sixth-round selection.
He has 31 career tackles and one interception.
Lewis tore his anterior cruciate ligament and missed the 2008 season, but came back to play the past two seasons.
The Broncos also worked out former San Francisco 49ers defensive tackle Sealver Siliga, an undrafted rookie free agent from Utah.
Siliga has also tried out for the Miami Dolphins this year.
At Utah, he recorded 97 career tackles and was voted honorable-mention All-Mountain West Conference.
The 49ers cut him on Sept. 3.
Miller is a former all-conference Colorado State player.
For more coverage of the NFL, go to profootball.scout.com.
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Broncos work out three defensive linemen
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