Luis Monti in San Lorenzo colours
San Lorenzo entered the Copa Campeonato in 1915.
They won the Asociación Amateurs de Football championship in 1923 and 1924 and were the first winners odf the unified title in 1927. Argentine football was professionalized in 1931. That season San Lorenzo finished second in the league behind Boca Junioirs. They won the title in 1933.
2 San Lorenzo players represented Argentina in the 1928 Olympic Gold Medal match- Luis Monti and Alfredo Carricaberry. Monti was the sole representative in the 1930 World Cup final.