The following twenty years saw a slow but steady improvement in the club's fortunes. In 1972, Lens reached the semi-finals of the Coupe de France, and the arrival of two Polish players helped the club win promotion to the first division. In 1975, Lens once again reached the final of the Coupe de France against the powerful Saint-Étienne, but lost the game 0-2.

As finalist of the Coupe de France, Lens had the opportunity to participate in its first UEFA Cup Winners' Cup,