I wouldn't spend anything this winter tbh. Most of these rumors seem fake and extremely uncredible. Considering there aren't decent and affordable players atm, better balance our books and avoid unnecessary expenditure.
Next summer though players like Vrsaljko and Rugani could be fantastic additions for our defensive woes. My countryman could be a solution for the LB, position that has been vacant since the days of Zambrotta. Berardi of course should get a chance here and we need to keep an eye on opportunities that we might come across during the summer.