If so, it would be a huge blow to the Broncos, who are hoping to contend with AFC West favorite San Diego this season.
ESPN first reported the extent of the injury Thursday. Dumervil was hurt at practice Wednesday night and was seen holding his right arm after a defensive drill. Dumervil signed a five-year, $58.3 million contract extension last month that included $43.2 million in guaranteed money, a record for a pass rusher.
Without Dumervil, the Broncos are without a legitimate pass rusher. Defensive lineman Darrell Reid had four sacks last year, the most of any returning Broncos defender other than Dumervil. But even Reid is hurting; he has a knee problem and hasn't taken part in camp just yet. The other outside linebackers are former first-round picks Robert Ayers and Jarvis Moss.