 On 17 March 2013, aged only 17, he made his senior debut for the reserves by coming on as a late substitute in a 0–2 Segunda División B away loss against La Roda CF.Despite being used sparingly, Matos was definitely promoted to the B-team only in the 2014–15 campaign.An undisputed starter, he appeared in 36 matches (all starts) as his side narrowly avoided relegation.