[2] Alarcón moved into the Rosario Central first-team in May 2015, when he was an unused substitute for a Copa Argentina tie with Deportivo Riestra.
[2][3] Alarcón joined Deportivo Roca on loan on 8 July 2016, but returned to Argentine Primera División side Rosario Central later that month for personal reasons.
[4][5] He subsequently was loaned to fellow Primera División team Talleres in August.
[2] Back with Rosario Central in June 2017, he again left on loan in July to Villa Dálmine of Primera B Nacional.
[2][7] He scored his first career goal versus Los Andes on 28 October 2017.