 Complete the following phrase:  On 1 January 2016, Fernández joined Atlético Madrid on a three-year deal for an undisclosed fee, mainly as a cover to the injured Tiago. He made his debut 5 days later, playing 57 minutes of a Copa del Rey draw away to Rayo Vallecano before being replaced by Luciano Vietto; he made his first league appearance for the club on the 11th of January, against Celta, his former team. Later, he started in the 