 He started his career at San Lorenzo in 1971, he played for the club for 8 years, in that time they won three trophies (1972 Metropolitano, 1972 Nacional and 1974 Nacional).In 1978 Olguín was included in Argentina's world cup squad.Following his success at the world cup he was sold to Independiente, where he spend some time battling Pedro Monzón for a place in the first team.