Career
He played professional football in Paraguay, and had short spells in Argentina, in Deportivo Mandiyú. A central defender, Caballero played for Club Guaraní, Club Olimpia, Club Sol de América and Deportivo Mandiyú. He played for Deportivo Mandiyú from 1990 to 1994.
A participant at the 1986 Fédération internationale de football association World Cup in Mexico, he obtained a total number of 27 international caps from 1983 to 1989.
Caballero was killed during a robbery at his office in Villa Morra on 6 May 2005.