Rotondi began his career with Newell's Old Boys, signing in 2015.[4][5] He made his senior debut on 11 June 2017 in the Copa Argentina, featuring for twenty-five minutes of a 4–1 victory over Central Norte.[4][6] Over a year later, Rotondi made his first appearance in professional league football during an away loss to Godoy Cruz on 27 August 2018.[4] In February 2019, Rotondi was loaned to San Luis of Primera B de Chile.[4] He scored his first senior goal on 16 March 2019 against Santiago Wanderers, a club he would later join on loan in January 2020; with them now in the Primera División having won promotion.[4][7]