I haven't seen much of Saponara so can't say. He hasn't played much in Serie A has he? Don't even think I've seen him once, just read his name.
I think we should keep Parolo at least until the end of the season. True he's not been very good in recent games but he's one of the few players in our midfield that keeps it alive and he does contribute to our players up front. When he's playing really good he becomes a threat in front of goal as well. Keep him for the rest of the season, if he improves even more then try to keep him of course...else we should sell him for a good price before his value goes down or exchange him for a player (and some money perhaps)
Our midfield is mostly poor tbf and the last thing we should do is get rid of the best players in it. We need a striker, another good midfielder and at least a right back or centre back. Felipe and Cassani are bad.