He made his senior debut with the reserves on 25 August 2019, starting in a 4–0 Tercera División away routing of Alhaurín de la Torre CF.
[1] Romero made his first team debut on 12 October 2019, starting in a 1–2 home loss against Cádiz CF in the Segunda División championship.
[3] On 8 August 2021, Romero moved to Real Sociedad on a one-year loan deal, with a buyout clause.
[4] Initially assigned to the reserves also in the second division, he made his first team debut for the Txuri-urdin on 16 September by coming on as a late substitute for Joseba Zaldúa in a 2–2 away draw against PSV Eindhoven, for the season's UEFA Europa League.
On 25 July 2022, Romero signed a two-year contract with Primera Federación side CF Intercity.