Boll interest in football began in an early age. She joined
FC Sion's youth team at the age of 12. In
1965, she took part in a match between Sion and Turkish club
Galatasaray in the
European Cup Winners' Cup. The media coverage of the match resulted in Boll having her licence to play football in Switzerland withdrawn since the
Swiss Football Association did not realize Boll was female. At the age of 17, Boll took the opportunity to play in professional football in Italy where she played for five years, she first signed with
Gommagomma. Her performances in
Serie A gained her the nickname "Montagna blonda" ("The Blond Mountain"). In 1975, Boll returned to Switzerland to play for the
FC Sion, winning the
Swiss Women's Cup in 1977. Boll during her playing days was nicknamed the White
Pelé. ==International career==