[4] Pastor made his senior debut with the reserves on 30 March 2019, starting in a 1–0 Segunda División B home win against UD Almería B.
On 3 December 2020, as starter Bono tested positive to COVID-19 and immediate backup Tomáš Vaclík suffered an injury in the warm-up, Pastor made his first team debut by playing the full 90 minutes of a 4–0 home loss against Chelsea.
[7] He subsequently lost his starting spot to Javi Díaz at the B-side, before being loaned out to Primera Federación side CD Castellón on 16 August 2022.
[8] On 17 January 2024, after spending the first half of the campaign unregistered, Pastor joined Levante UD on a short-term deal;[9] despite being announced at the reserves, he never featured for the side, being only a third-choice behind Joan Femenías and Andrés Fernández with the main squad.
[10] Pastor represented Spain at under-17 level in the 2017 FIFA U-17 World Cup, acting as a backup to Álvaro Fernández as his side finished second in the tournament.