 During his first season he was used intermittently, as the Castile and León side also suffered top flight relegation.On 30 August 2010, English club Derby County announced that Bueno was a guest at the Rams' 2–2 draw against Queens Park Rangers, and that a loan deal was very close to being completed in time for the close of the transfer window.It was revealed the following day that the player signed on a season-long loan.