Broncos linebacker Elvis Dumervil, who led the NFL last season with 17 sacks, might be done for the year because of a torn pectoral muscle.

If so, it would be a huge blow to the Broncos, who are hoping to contend with AFC West favorite San Diego this season.

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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.