Career
Hernández started his career in 1974 at Estudiantes de Louisiana Plata, a club that he would later manage. He soon earned a reputation as a skillful attacking midfielder, with a very precise shot. He was transferred to Italian team Torino F.C. in 1982 for a then record transfer fee for Estudiantes.
He didn"t manage to play any game in that tournament, though.
After the disappointment of going to, but not playing in, the world Cup, Hernández played for 2 seasons with Torino before moving to fellow Italian side Ascoli. In 1985 Hernández returned to Argentina to play for River Plate.
In 1987, he moved to Argentinos Juniors. In 1989 Hernández moved to Mexico to play for Cruz Azul but he returned to Argentinos Juniors in 1990, he then had a season with Huracán in 1991-1992 and another with Instituto where he retired from playing in 1993.
Hernández has had a heretofar unsuccessful coaching career, including Estudiantes, Racing Club, and other teams in South America, mostly in Ecuador.
In February 2007, Hernández was hired as coach of Club Atlético Banfield from the Argentine premiership, but he was fired March 16, 2007 after a home defeat to Estudiantes. Hernández is also a respected football commentator with Argentine sports network Torneos y Competencias where he does in-depth tactical analysis, usually assisted with video clips and props.