Giannetti began her professional career February 2016 with Arna-Bjørnar in the Toppserien, Norway's top women's league.[3][9][10] During her rookie 2016 season, she started all 25 official matches during the season, including 22 in the Toppserien League. Giannetti was named the top keeper during the first half of the season.[11][12]
After the 2016 season, she was named the Toppserien Goalkeeper of the Year by the Norway Football Association.[3][13] She re-signed with Arna-Bjørnar for the 2017 season[14] but left the club at the end of the season, returning to studies in the USA.[15]
^Jansen, Richard (May 11, 2016). "Lene mykjåland årets spiller i Toppserien" [Lene Mykåland is this year's player in the Toppserien]. Serieforeningen for kvinnefotball. Archived from the original on February 2, 2017. Retrieved June 2, 2019.
^"Nå forsvinner fem spillere fra Arna-Bjørnar" [Now five players from Arna-Bjørnar disappear]. Aftenposten (in Norwegian). Oslo. November 30, 2017. Retrieved June 2, 2019. Keeperne Alyssa Giannetti (studier i USA) [Keeper Alyssa Giannetti (studies in the USA]