 He made his debut for the first team on 13 April 2008 in a 0–1 loss away loss against UD Almería, subbing in for sent off Diego López in the 18th minute.Previously, he was the undisputed starter for the reserves during three full seasons, starting in all the games he appeared in, including in 2008–09 as they promoted to the second division for the first time ever.During the 2007–08 and 2008–09 campaigns in La Liga, Juan Carlos was third-choice behind López and Sebastián Viera.