The Dennard thing is perplexing to me. He hurt it at the end of the Steelers game, was apparently practicing, hurt it on Friday and was essentially immediately ruled out.
If figure he either re-injured something that does not require surgery but does need more rest (patellar subluxation, MCL sprain), or he has an entirely new injury (maybe tore his meniscus in practice and had it scoped already).
Either way, I doubt he'll be back until mid-December or so.
As for Talib... who the hell knows. Being out for a month and then not even being able to finish a game when he was so clearly needed does not speak well for whatever is going on with his hip. I think we've reached the point where even if he starts, there's no way you can count on him being available for the entire game, and that puts our secondary in a VERY tenuous position.