Pierotti started his career in
Colón's ranks; having signed in 2014. He, aged eighteen, appeared for his professional debut on 12 April 2019 in the
Copa de la Superliga against
Tigre, replacing
Marcelo Estigarribia after eighty-four minutes as the first round, first leg ended 0–0. On 13 January 2024, it was announced that
Serie A club
Lecce had reached an agreement with Colón for the permanent transfer of Pierotti, subject to the results of medical tests and international clearance. The deal was made official three days later, as the player signed a contract until June 2027, with an option for another year. ==International career==