Cornerback Alfonzo Dennard's knee injury is going to keep him out a while longer.

Dennard is not expected to play Sunday against the Broncos, and it might be even longer than that, according to a source. The timing of the injury is difficult, as the Broncos rank first in points, total yards, passing yards and passing touchdowns.

Dennard's knee originally appeared on the injury report last week, and he missed Saturday's practice -- his first regular-season absence in 2013 -- and was immediately ruled out of the Panthers game.

The Patriots are already hurting in the secondary. Cornerback Aqib Talib missed three games with a hip injury and missed the end of last night's game after aggravating the ailment.