[1] Marcioni began his footballing career in the system of Newell's Old Boys, with his senior debut arriving in May 2018 during a Copa Argentina encounter with non-league Deportivo Rincón.
[1][3][4] In the following November, Marcioni was selected for his professional league debut by manager Omar De Felippe in a Primera División fixture against Defensa y Justicia; he was substituted on with eight minutes remaining of a goalless draw.
[1][5] Two further first-team appearances followed in league and cup, prior to Marcioni leaving on loan in July 2019 to Independiente Rivadavia of Primera B Nacional.
[1] Marcioni netted goals against Nueva Chicago, Deportivo Morón, Platense and Alvarado whilst with La Lepra.
[1] August 2020 saw the forward leave Newell's on loan again, as he agreed terms with fellow second tier team Atlanta.