Born in Las Rozas, Community of Madrid, Castel made his senior debut with Tercera División side UE Rubí, in the 2012–13 season.
In July 2013, he joined CA Osasuna and returned to the youth setup, but on 31 January of the following year, he was loaned to CD Tudelano in Segunda División B, for six months.
[2] He then signed for Las Rozas CF, a club he already represented as a youth, before moving abroad to Bendigo City FC in Australia.
[4] In August 2019, after scoring a career-best 13 goals for Sanse, Castel joined Atlético Madrid, being initially assigned to the B-team; subsequently, he was loaned to Indian Super League side Jamshedpur FC until the end of the year.
[9] On 14 July 2021, after being a regular starter in their first-ever promotion to Segunda División, Castel signed a permanent two-year contract with Ibiza.