A compact, relentless defender known for his spin move, Dumervil finished second on the Broncos with 11 sacks last season behind Pro Bowl outside linebacker Von Miller.
Dumervil was signed to a six-year, $61.5 million contract negotiated by the late Gary Wichard, who also negotiated Ravens outside linebacker Terrell Suggs' six-year, $62.5 million contract that included $38.1 million in guaranteed money.
Dumervil was paid $14 million during both the 2011 and 2012 seasons.
The Ravens have also spoken with former Pittsburgh Steelers outside linebacker James Harrison's agent, Bill Parise. Nothing has developed yet as far as contract negotiations or a visit, according to Parise.