Brendan Rodgers had completed the signing of 19-year-old defender Javier Manquillo on a two-year loan deal, reports BBC.
The Spanish defender joins new singing Dejan Lovren in the Reds defence and is Brendan Rodgers second defensive signing of this transfer window.
Manquillo's career so far
Manquillo had spent all of his career in Madrid before his move to Merseyside, starting his career at Atletico's bitter rivals Real Madrid before making the move across the Spanish capital to the Vicente Calderon.
Manquillo made his debut for Atletico Madrid at the age of 17 and played six times. However, Manquillo suffered an injury to his vertebrae in February playing against Real Madrid in the Copa Del Rey semi-final, which ruled him out for the rest of the season.
Manquillo completes switch to Merseyside
The deal is a two-year loan deal, with an option to buy at the end of his first season at Anfield. Manquillo will provide cover for current right-back Glen Johnson who joined the club from Portsmouth in 2009.
The singing of Manquillo brings some much welcomed defensive cover at Anfield as it could be argued that it was the Red's defence that cost them the Premier League title in the last few games of last season.