I absolutely think he'll be up within a week. Rotate between 3B, RF and DH. I don't think Vargas is long for this roster, Twins didn't want to recall him when they did. Barring a big trade, which I don't see and would probably be a mistake, or a complete reversal by Arcia, Sano is the last bullet to improve the offense. Everything else is just tweaking at the margins (which isn't to say they shouldn't do moves when the opportunity presents itself, just that the difference won't be as significant as what Sano could possibly bring to the table).