49ers’ Shanahan says McCaffrey `day to day’ with calf/Achilles’ injury

Christian McCaffrey’s status will continue to be judged on the fly, his availability to be determined by how he’s feeling with an eye toward the long haul rather than a specific Sunday. McCaffrey was a surprise scratch from Monday night’s 32-19 win over the New York Jets at Levi’s Stadium, with a calf/Achilles’ injury. And it’s been an issue that’s been going on for some time, meaning there could be a lot more Jordan Mason in the 49ers’ immediate future with the Minnesota Vikings coming up in Week 2 on...