[6] Their first outgoing was publicised in the preceding May, with goalkeeper Matías Vega agreeing a move to Primera B Nacional's Deportivo Riestra.
[29] Juan Silva was captured by Villa San Carlos on 15 July, while Hernán Burbano arrived from Atlas later that day.
[32][33] Román Martínez joined from San Lorenzo on 18 July, as Lucas Villalba made his loan spell permanent.
[41][42] Aldosivi's Primera División season started with a loss away to Estudiantes, with Jonathan Schunke condemning them to defeat on 29 July.
[49][50] Argentinos Juniors visited Aldosivi's Estadio José María Minella in the Primera División on 3 August, subsequently taking a point away following a goalless tie.
[51] Gonzalo Verón gave Aldosivi a friendly victory over Atlético Camioneros on 9 August, though it was followed by a 1–2 defeat to the same opponents hours later.
[53][54] Aldosivi failed to win any of their first three league fixtures, after extending their streak on 18 August with a defeat at La Bombonera to Boca Juniors.
[55] Aldosivi got their opening three points on the board on 26 August, as they thrashed Atlético Tucumán by three goals at home in Mar del Plata.
Primera B Nacional's Quilmes scheduled pre-season friendlies with Aldosivi on 20 June 2019, with the matches set for 20 July in Mar del Plata.