[3] On 20 August 2017, aged just 16, Rober made his senior debut with the reserves by starting and scoring the opener in a 4–1 Segunda División B home routing of CF Lorca Deportiva.

On 1 November 2018, Rober made his first team debut at the age of 17, coming on as a late substitute for Takashi Inui in a 1–0 away defeat of Racing de Santander, for the season's Copa del Rey.

[6] On 3 September 2020, Rober was loaned to Segunda División side UD Las Palmas, for one year.

[8] Rober scored his first professional goal on 3 October 2020, netting the opener in a 2–1 home win against UD Logroñés.

Rober made his La Liga debut on 14 August 2021, replacing fellow youth graduate Rodri in a 1–1 away draw against RCD Mallorca.