On 8 December 2013 Aarón first appeared with the main squad, being an unused substitute in a 3–3 Copa del Rey home draw against CA Osasuna.
[4] Aarón made his professional debut on 13 September 2018, starting in a 2–1 loss at Elche CF, in the season's Copa del Rey.
[6] A backup to Rui Silva, Aarón made his La Liga debut on 8 February 2020, starting in a 1–0 loss at Atlético Madrid.
[7] On 10 December, he made his European bow in a UEFA Europa League group stage game away to PAOK FC, a goalless draw.
[8] Silva left Granada in the summer of 2021 and Aarón became the new starting goalkeeper for the first matches of the season under incoming manager Robert Moreno, despite the arrival of another Portuguese, Luís Maximiano.