[4] Inheriting his passion for football from his father, Subiabre's first club was El Globito in his native Comodoro Rivadavia, whom he joined at the age of four.

[5] He would remain officially with CAI, due to the long travelling distance from Comodoro Rivadavia to Buenos Aires, though he would return to River Plate semi-regularly to feature for their youth teams.

[6] In November 2023, River Plate manager Martín Demichelis stated that Subiabre, alongside teammates Agustín Ruberto and Ulises Giménez, would feature in the senior squad's pre-season preparations.

[8][9] However, in September of the same year, he accepted a call-up from Argentina under-17 coach Pablo Aimar, and would go on to make his debut for the side at the 2022 Copa Ciudad de Ezeiza, coming on as a second-half substitute in a 4–0 win against Peru.

[11] Subiabre describes himself as a "powerful striker and scorer", though he is often utilised as a winger, and names fellow Argentine Julián Álvarez as an inspiration on his style of play.