Patrick Ostachuk began his youth career as a midfielder in 2004, aged four, with Olimpia de Oberá; who'd later be known as Olimpia / San Antonio after a merger.[3][5] In 2014, Ostachuk had a number of trials with Newell's Old Boys - who would sign him in 2015.[6] However, Ostachuk remained at Newell's for just one year before departing.[3] 2016 saw Ostachuk, following a trial, join Independiente.[3][7][8] He made the breakthrough into first-team football in 2020, having transitioned into a centre-back in the preceding years.[4] Ostachuk made his senior debut on 6 December 2020 during a Copa de la Liga Profesional victory over Defensa y Justicia.[4]