N'Kono served as assistant coach to the Cameroon national team, at the same time as being goalkeeping coach at former club Espanyol. In 2002, he was arrested by Malian police for allegedly using "black magic", prior to the African Cup of Nations semi-final against Mali (3–0 win). He was dragged onto the running track after stepping onto the pitch at the "26 March Stadium" alongside coach Winfried Schäfer, and eventually received a one-year ban, which was then lifted, although he was not allowed to sit on the bench for the final; the former also received an apology from the office of the Malian president.