Kyle Shanahan: It's 'not guaranteed' that 49ers' George Kittle will play vs. Seahawks in Week 4 | CBS Sports Headlines Kyle Shanahan: It's 'not guaranteed' that 49ers' George Kittle will play vs. Seahawks in Week 4 Kittle has been battling a sore calf ESN FeedsThis post was originally published on … Continue reading Kyle Shanahan: It's 'not guaranteed' that 49ers' George Kittle will play vs. Seahawks in Week 4