Or just don't sell anyone. I mean Benatia isn't worse than Bonucci and he earns much less. The former's transfer fee was lower as well so he's much cheaper for us and reliable. Bonucci would cost a lot in terms of transfer fee and wages.
Caldara and Rugani are both very promising and are relatively cheap to our books as well. Allow them to rotate with Chiellini/Benatia and soon enough both will be able to take Chiellini's and Benatia's places. Barzagli as a back up in terms of emergency.
Don't try to fix if it's not broken.
Offload Higuian, Pjaca and Sturaro then close the mercato