Sabella joined the San Lorenzo youth ranks midway through 2016.[2][3][4] He was promoted into their first-team squad four years later, initially as an unused substitute for a Primera División win away to Aldosivi on 1 March 2020.[1][5][6] His senior debut eventually arrived on 7 November 2020 against Estudiantes in the Copa de la Liga Profesional, as he came off the bench to replace Lucas Menossi with thirteen minutes left of a 2–0 victory.[1]