As a youth player, Hernández was with Casa El Valle and Magallanes in his city of birth.
[1] At senior level, he made his debut with Magallanes and played for several clubs in his homeland such as O'Higgins,[2] Universidad Católica,[3] Regional Antofagasta, among others.
[4] As a football coach, he began his career with Municipal Las Condes.
At professional level, he first coached Deportes La Serena in 1993.
[5] After leading O'Higgins[2] and Audax Italiano, he became the manager of Universidad de Chile and Colo-Colo.[5] After coaching O'Higgins in 2010, he was Chile national team youth series’ director of football.