Dumervil had two tackles and a forced fumble when he left Sunday's 36-14 win over in the second quarter.
Coach John Fox said Monday that the injury was a muscle strain and the Broncos would know more when they return to practice Wednesday.
The seventh-year veteran missed all of 2010 with a torn pectoral muscle, then came back last season and made the Pro Bowl with 9Â½ sacks.
Dumervil, who led the league with 17 sacks in 2009, has six this season.
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