[6][7] In the summer of 2008, Castro joined fellow league side Deportivo de La Coruña on a season-long loan, with the Galicians having a buyout clause of €2 million for 50% of the player's rights; the remaining 50% were owned by a company.

[8] Again due to injury – habitual starter Pablo Amo was sidelined for months with an Achilles tendon problem – the Portuguese was able to start most of the campaign, and the option was activated for a permanent move.

[11] In March 2011, he was to be picked as a last-minute substitute for a league match against Real Sociedad after Aythami Artiles went down with a bout of gastroenteritis, but did not present himself at the Estadio Riazor and could not be traced through his mobile phone.

[12][13] Following Depor's two relegations in the space of three seasons, and a promotion in between, Castro returned to both Madrid and the Spanish top flight on 29 August 2013, signing a one-year deal at Rayo Vallecano.

[19] On 10 May of the following year, in spite of a poor season at Deportivo, he was included in a provisional squad of 24 players announced by Carlos Queiroz in view of the 2010 FIFA World Cup; however, after Pepe recovered in time to participate in the competition, he was cut.