He made his senior debut with the reserves on 13 September 2017, starting in a 3–0 Tercera División away defeat of CD Melistar.
[1] On 7 September 2019, as starter Munir was on international duty, Kellyan made his first team debut by playing the full 90 minutes in a 0–1 home loss against UD Almería, in the Segunda División.
[2][3] The following 19 August, he renewed his contract until 2022 and was immediately loaned to Segunda División B side UD Ibiza for the campaign.
[4] Kellyan was a backup to Germán Parreño as Ibiza achieved a first-ever promotion to the second division.
On 7 August 2021, he signed for El Palo FC of the Tercera División RFEF.