After rejoining the Swiss championship in 1916, GC won their fifth championship in 1921. In 1925 started the era of the Hungarian manager Izidor "Dori" Kürschner, a former member of the coaching staff of the Swiss national team that won the silver medal at the 1924 Olympics. Under Kürschner in the 1920s, Grasshopper won the championship twice (in 1927 and 1928) and also the first two editions of the Swiss Cup in 1925–26 and in 1926–27.
