Background
Castaño was born in Las Palmas, Canary Islands.
Castaño was born in Las Palmas, Canary Islands.
After starting out with AD Huracán"s, he completed his formation with Real Madrid, joining its youth system in 2007 at the age of 14.
He made his senior debut on 13 May 2012, playing with the C-team against CF Trival Valderas. In the 2012 summer Castaño joined AD Alcorcón, initially being assigned to the reserves. On 2 February 2013 he appeared in his first game as a professional, playing 20 minutes against in a 0–3 away loss against Hércules CF. On 2 September 2013 Castaño joined another reserve team, UD Las Palmas Atlético, in Segunda División B.