Cutler was in a walking boot last week with his high-ankle sprain. This is a tricky injury and they can vary in severity and its subsequent prognosis, so it's not a surprise that Cutler will sit. Peyton Manning has been able to play through his while others could miss the entire season.
Fantasy impact: The Bears get a terrific matchup against the Vikings. They have the worst defense in the league based on points per game and have shown no signs of improvement, especially with how banged up their secondary is. McCown should be able to sling the ball around to Brandon Marshall and Alshon Jeffery. He is a low-end QB1 for any owner that isn't confident in their usual starter. Jay Cutler can be cut in most leagues since he wasn't playing very well while he was healthy.