After beginning his career with native Club Atlético Platense, 21-year-old Díaz moved to Spain in 1997, going on to remain in the country the following 12 seasons. Two years earlier, he was picked to represent Argentina at the FIFA U-20 World Cup, with the national team winning the tournament in Qatar after defeating Brazil 2–0; during his career, he was nicknamed Camioncito (Little Truck).[1]
In the 1998–99 campaign, Díaz achieved his biggest team success, winning La Liga promotion with Andalusia's Málaga. He only contributed with five matches to this feat, however, having arrived during the winter break.[5]
After retiring, Díaz worked as assistant to Granada CF president Quique Pina.[6]