Coacci's career got underway with Olimpo of Primera B Nacional.[2][3][4] The 2018–19 season saw the midfielder join the club's first-team, with Coacci initially being an unused substitute for a Copa Argentina match against Aldosivi on 20 July.[2] Nine days later, in the round of thirty-two, Coacci featured for twenty-eight minutes of a 1–0 defeat to Gimnasia y Esgrima.[2] His league debut arrived in the following November in a loss to Platense.[2][5][6]