Johny Schleck raced at the 1964 Olympics in the road race, placing 19th. He had by then won the GC at the 1973 Fleche de Sud in Luxembourg, two stages at the 1964 Österreich-Rundfahrt, and stage two of the 1964 Tour de l’Avenir. After the Olympics Schleck turned professional and was a solid domestique from 1965-74 in the professional peloton, riding in eight Tours de France (1965-68, 1970-73), with a best finish of 19th on GC in 1970. His major victory as a professional came in winning stage 12 of the 1970 Vuelta d’España. He also won two stage victories in 1967, stage 3 at the Tour de l’Oise and stage 4 at the Ronde van Luxemburg.
Schleck rode for Pelforth-Sauvage-Lejeune from 1965-68, and Bic from 1969-74, and he was a good lieutenant for two Tour winners, [Jan Janssen] in 1968 and Luis Ocaña in 1973. Schleck is perhaps better known as the father of [Andy] and [Fränk Schleck], two talented professional racers who competed professionally around 2010, with Andy winning the 2010 Tour de France.