City manager Pep Guardiola has expressed his great admiration for the Inter midfielder.
Materazzi told La Gazzetta dello Sport: "Barella, Calhanoglu and Mkhitaryan (will start against Milan on Sunday).
"Did you see Nicolò's performance against Manchester City? It is easy to understand why Guardiola wanted to sign him. In my opinion he is worth as much as Rodri.
"It's a different role, but the level is the same."