In the 1950s, he appeared in the crime drama Rififi[1][2] (1955), which François Truffaut ranked as the best film noir,[3] directed by American Jules Dassin,[2][3] in which he played a leader of a gang of jewel thieves.

In the 1950s and 1960s, Servais rejoined the Renaud-Barrault theatre troupe for several plays, including La Répétition ou l'Amour puni (1950), Volpone (1955), and Marat/Sade (1966).

In the 1960s, Servais took small character roles in popular international fare such as The Longest Day (1962), an epic recreation of the Allied invasion of Normandy, and That Man from Rio (1964).

Other films in which he acted include Le Sahara brûle (1961), Un Soir Par Hasard (1964), and Avec la peau des autres (1966).

He had roles in several films in the early 1970s, such as The Devil's Nightmare (1971), an Italian horror series, and Le Protecteur (1974), about a recently released prisoner who tries to find his daughter who has fallen into the underworld of prostitution.