49ers running back Christian McCaffrey has two more weeks on injured reserve, but after two weeks of rest, he’s readying to see what he can do in rehab. “I think we’ll get a better idea here over the next couple of weeks,” coach Kyle Shanahan said on his weekly radio appearance on KNBR, via David Bonilla of 49erswebzone.com. “The whole point of putting him on IR is to guarantee that we couldn’t do anything for at least four weeks, and two weeks into it, the whole point was just to rest him for two weeks and not do that.