Born in Aguas Blancas [es], an extinct commune in the current Antofagasta Province, Contreras made his debut with Colo-Colo in 20 May 1939.

[1] At the end of his career, he played for Mexican club América.

[3] He played in 14 matches for the Chile national football team from 1941 to 1945.

[4] He was also part of Chile's squad for the 1941 South American Championship.

This biographical article related to Chilean football is a stub.