A Real Madrid youth graduate,[4] Madrid-born Adán was the first-choice goalkeeper for its C side in the 2005–06 season, playing 36 games and conceding 29 goals.

[7] After the sale of Codina to neighbours Getafe CF, Adán was promoted to the senior squad for pre-season training in the 2009–10 campaign.

[10] Adán made his La Liga debut on 13 February 2011, replacing sent off Casillas in the second minute of a 1–0 away victory over RCD Espanyol.

[17] On 27 January 2014, Adán terminated his link to the Sardinians and returned to his country and its top division, joining struggling Real Betis.

[26] He was a key player as they won their first Primeira Liga title in 19 years, keeping 20 clean sheets and conceding just 19 goals in 32 matches.

He was sidelined in the final two months after suffering an injury in training, but still contributed 22 appearances to the feat before being replaced by Uruguayan Franco Israel.

[29][30] In July 2006, Adán captained the Spain under-19 team all the way to winning the UEFA European Championship alongside four other Real Madrid products: Alberto Bueno, Javi García, Esteban Granero and Juan Mata.