Рио-Куарто
Born in Río Cuarto, Córdoba, Colotto started his professional career with Estudiantes de La Plata, making his Primera División debut on 16 February 2001 in a 1–1 draw against Club Atlético Vélez Sarsfield and eventually becoming an automatic first-choice with the La Plata club. In December 2004, Tecos F.C. from Mexico paid US$1,100,000 for his services and, almost three years later, he was signed by another team in the country, Club Atlas, playing nearly 150 competitive matches between the two.