In 1979, Reinoso played a season with Deportivo Neza, before retiring and embarking on a coaching career.

In 1981, Reinoso was named head coach of Club América, with whom he won two league titles, most notably winning the 1983–84 final against rivals Guadalajara.

He would go on to manage a number of different clubs in Mexico including former club Neza, Tigres UANL, Tampico Madero, Atlas, Veracruz, León, Atlante, Quéretaro, Tecos UAG, and San Luis, with varying degrees of success.

[8] In Mexico, he was nicknamed El Gran Chaparral by the journalist Ángel Fernández [es] due to his short height and great football qualities.

[9] He married the Mexican singer Lupita D'Alessio and dated Verónica Castro.