Manchester City attacker Julian Alvarez has shared when Inter Miami captain Lionel Messi could retire from Argentina duty. The 36-year-old attacker heads is due to lead the reigning FIFA World Cup champions at this summer’s Copa America, a competition that has been billed as potentially Messi’s last on the international stage with Argentina. As a world and continental champion, there would be a lot of logic behind Messi calling time on time as Argentina’s captain and talisman, with Inter Miami now a priority for the former FC Barcelona superstar. And Alvarez has now given his verdict on when M…