[1] He made his first-team breakthrough during the 2018–19 Torneo Federal A, making his debut off the bench on 2 December 2018 in a victory away to Altos Hornos Zapla.

[2] Portillo scored his first goal in his next appearance, netting in a Copa Argentina qualifying round first leg draw with San Martín de Formosa on 16 January 2019.

[2] Midway through the year, Portillo was loaned with three teammates to Paraguay with Primera División B Nacional side Deportivo Itapuense; an affiliate of Crucero's.

[4][5][6][7] After appearing seven times back with Crucero in 2019–20, Portillo left permanently to join Primera División outfit Unión Santa Fe in July 2020.

[9] His first competitive appearance arrived on 28 November against Racing Club in the Copa de la Liga Profesional; replacing Kevin Zenon with seventeen minutes remaining.