As Minnesota Vikings rookie quarterback J.J. McCarthy is set to go under the knife for a repair to a meniscus in his knee, his status going forward is not entirely clear. And that’s because it will depend on what the surgeon decides to do once they’ve finally gotten an up-close look at the issue. It was reported earlier on Tuesday that McCarthy would get the issue surgically repaired. But either way, the Vikings are likely to be in a spot to weather the storm if McCarthy is out for a matter of weeks or the whole season, according to NFL Network’s Ian Rapoport. That’s because the Vikings signed…