FC Sion from locals, and played their first competitive league fixture in 1914, again a 3–2 victory, against FC Monthey. In 1919, Sion formally organised its managerial structure, with Gilliard becoming vice-president and Charles Aymon taking the presidency. From 1932, Sion played in the fourth tier of Swiss football, where they spent much of the next 20 years, briefely interrupted by promotion to the third tier in 1944, quickly followed by relegation in 1946. In 1952, Sion returned to the third tier. Five years later, Sion gained promotion again to the National League B, followed five years later by promotion to the
Ion Theodorescu-Sion government ordinance. Theodorescu-Sion died in Bucharest, on March 31, 1939, and was buried in a Bellu cemetery crypt. His last selection of works was presented to the public as part of the Official Salon, which opened the same month in Bucharest. "Gândirea" published his obituary, signed by Crainic, and opening with the words: "Theodorescu-Sion died unexpectedly, in the full summer of his life and of his boundlessly fecund talent." Theodorescu-Sion was probably the most protean Romanian oil painter. Sion's interests in trying out formulas was taken with reserve by some in the public. Writing for the Transylvanian readership of "Luceafărul",