Born in
Las Palmas,
Canary Islands, Castellano graduated from
UD Las Palmas' youth setup, and made his senior debut with
the reserves in 2006, in the
Tercera División. On 2 January 2008 he appeared in his first game as a professional, playing the full 90 minutes in a 2–1 away loss against
Villarreal CF in the
round of 32 of the
Copa del Rey. On 31 January 2008, Castellano moved to another
reserve team,
RCD Mallorca B also in the fourth division. On 14 August, he was loaned to
Segunda División B club
Cultural y Deportiva Leonesa in a
season-long deal. After another loan stints at
Albacete Balompié and
Real Unión, Castellano cut ties with the
Balearic Islands side in June 2011. Late in the month, he returned to his first club Las Palmas after signing a three-year contract. Castellano played 43 games in the
2014–15 campaign –
playoffs included – helping to a return to
La Liga after 13 years. He made his debut in the competition on 22 August 2015, featuring the full 90 minutes in a 1–0 defeat at
Atlético Madrid. It was his only appearance of
the campaign, due to a serious knee injury. ==Personal life==