Initially in charge of the youth setup, he was included in the first team staff during the 2012–13 season.
[3] On 4 December 2017, Romero replaced fired Juan Merino at the helm of the main squad in Segunda División.
[4] His first professional match occurred six days later, a 2–2 home draw against Rayo Vallecano.
[6] On 9 July 2019, after more than a year without coaching, he was appointed manager of AD Alcorcón's B-team in Tercera División.
[8] He returned to Alkor and its B-side on 19 July 2021,[9] but was named at the helm of the main squad on 18 September after Juan Antonio Anquela was sacked.