Originally surgery was a viable option, but the injury has progressed and is expected to heal on its own in the offseason.
"He has healing powers beyond all of us," Sherman said of his quarterback. "I'm not trying to be funny – it's really true.
Playing through the injury, Favre was able to extend his NFL record starting streak to 208 games including post-season.
"The guy is a freak of nature in regards to his body. That's why I have confidence that he'll play for quite a while."