Рио-Куарто
Born in Río Cuarto, Córdoba, Herrera started his senior career with Argentine giants Boca Juniors in 1991 after signing from his local club Estudiantes de Río Cuarto. During his tenure, he played understudy to the likes of Carlos Navarro Montoya; on 16 May 1993, in a reserve game against Club Atlético Independiente, a clash with an opponent resulted in head trauma, a depressed cheekbone, orbital fracture and torn ligaments, which sidelined him for nine months.