straight to your inboxPep Guardiola has hailed Nicolas Otamendi as THE key defender in Manchester City's greatest-ever season.The Blues manager said his farewells this week to the 31-year-old, who has joined Benfica in a £13.7million move, with Ruben Dias heading in the other direction for £65.2million.And while many City fans are glad to see the back of the Argentina international after some poor performances in the past two seasons, Guardiola had nothing but praise.And he pointed out that when