[3] He was assigned to the C team, and made his senior debut on 30 August of that year by coming on as a substitute for Mario González and scoring in a 1–3 home loss against CD Castellón in the Tercera División.
[4] On 3 January 2016, Raba first appeared with the reserves by replacing Alfonso Pedraza in a 2–2 Segunda División B home draw with RCD Espanyol B.
Definitely promoted to the B side ahead of the 2016–17 campaign, he scored his first goal for them on 28 August in a 1–1 home draw against CF Gavà, and renewed his contract on 4 June 2017.
[5] Raba made his first-team debut on 25 October 2017, replacing fellow youth graduate Leo Suárez in a 1–0 loss at SD Ponferradina in the round of 32 of the Copa del Rey.
[7] On 23 November 2017, Raba scored his first professional goal, his team's first in a 3–2 victory against FC Astana in the group stage of the UEFA Europa League.