A bit off topic, but since we are talking about Otamendi and Rojo, I always felt that Argentina's supposed defensive weakness was overstated.
Otamendi is a good defender, Rojo is a good defender. Musacchio from Villarreal is very good. Mercado from Sevilla is good. That Mammana kid from Lyon is very promising. Mascherano and Zabaleta are a bit old but not yet finished IMO.
Granted they aren't big stars like the attacking players from that country (Messi, Aguero, Di Maria, Higuain), but there's a reason to why Argentina have conceded very few goals in the past 3 international tournaments.