I wasnt really sure about this, but Bijol for that central CB should be considered. My concers were how soon will he adapt to playing CB, as he was a defensive mid most of his career, but he's doing great for Udinese. He's also good with his head and can play some nice long passes. I saw most of Udinese games this season and the only mistake i can really remember him doing, is the Lautaro goal from our last game. I am also pretty sure he would not cost more than 10-15M, which aint a lot... well, ok for inter it is perhaps, but still, would be a good cheap option.