Delfino emerged from the youth ranks of Club Atlético Banfield. On October 1, 1988 he made his debut with El Taladro in a 2-0 victory over Chacarita. In 1991 he was loaned to first division club Quilmes. After six months playing for the cerveceros, Delfino returned to Banfield and helped the club gain promotion to the Argentine Primera in 1992. Later, he transferred to Rosario Central where he played during 1994. The following year he made his third and last spell with Banfield, playing for the club until the Clausura '96. From there, Delfino went to spent some years in second division making appearances for San Martín de Tucumán, Atlanta and Sportivo Italiano.