49ers' lose fullback Juszczyk for 4 to 6 weeks

Daily 49ers blog for NBC Bay Area website: Fullback Kyle Juszczyk, one of the keys to the success of the running game, will be out of action for a while because of a knee injury. https://www.nbcbayarea.com/news/local/Niners-Running-Attack-Will-Miss-its--562624651.html