Spanish midfielder led Atletico Madrid to the La Liga title in 2014, the club's first league title in 18 years. He previously won the UEFA European Under-19 Championship representing Spain in 2012.
He joined the Atletico Madrid youth squad in 2008, when he was 13 years old.
He was nominated for the Golden Boy award as the best young player in Europe for 2014.
He was born in the municipality of Navalmoral de la Mata. He began dating Instagram star Patricia Gómez.
He made his UEFA Champions League debut replacing an injured Raul Garcia in October 2013.