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Liverpool FC have completed their loan-move for Atletico Madrid right back Javier Manquillo.

The Spaniard arrived on Merseyside this week for a medical ahead of the move. Manquillo signed on a two-year loan deal with the option of a £5m permanent transfer.

Manquillo is very highly rated in Spain and the Reds had to beat off competition for Arsenal for his signature.

Nevertheless, the 20-year-old is certainly not a household name, so just who is Javier Manquillo? And what can he add to Brendan Rodgers’ Liverpool team?

Manquillo was born on May 5, 1994 and, alongside his twin brother Victor, started playing football for Real Madrid at a young age. The two brothers played for Madrid’s youth teams until Victor was eventually released.

Watch: LFC reporter James Pearce on Alberto Moreno and Javier Manquillo

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However Real would live to regret that decision as blood proved thicker than water for the brothers and Javier left Real Madrid shortly after and eventually made the move to city rivals Atletico alongside his sibling.

And it was at Atletico that Manquillo prospered, making 46 appearances for the B team and eventually making his first team debut in 2011 against Egyptian outfit Zamalek - aged just 17.

Victor, meanwhile, ended up making the move to Rayo Vallecano (the other Manquillo sibling is on Twitter, you can follow him @VictorManquillo).

Despite making his first-team debut in 2011, Manquillo would continue to make the majority of his appearances for Atletico’s B team until this year saw him make the breakthrough into the first team setup as Juanfran’s deputy.

And that is where he caught the eye.

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Much like Glen Johnson, Juanfran is a very attacking full back, capable of bursting further up the field and supplementing Atletico’s attacks.

Manquillo is no different. He is pacey, and likes to use his speed to run directly at opposition full backs, overlap and get in behind the defence.

But more importantly than that, he is defensively sound.

Manquillo is certainly not afraid of a tackle and the right-back will delight the Anfield crowd with his willingness to place himself in harm’s way in order to win the ball back.

This is why the Spanish youngster is rated just so highly. He has the balance right between offering a threat going forward and, unlike a lot of modern day full backs, takes his defensive duties very seriously.

He can, though, but a little rash in his defending. Manquillo fouled Cristiano Ronaldo to give away a penalty in the Copa Del Ray semi-finals last year and, later in the same game, over-committed for a header which saw the youngster fall face-first onto the pitch, injuring his vertebrae in the process and leaving him out of action for around a month.

Call it over-eagerness or call it reckless, but that is something that will certainly subside with age.

Nevertheless, Manquillo's statistics for "Duels won" on Squawka compare favourably with his Atletico team-mates. His average of 59% is higher than Chelsea's big money signing Felipe Luis, as well as Diego Godin, Miranda and Juanfran.

It's also higher than Johnson's total of 55% and Jon Flanagan's 47%.

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He's also above many of his team-mates for his average defensive actions, showing Rodgers is adding steel to a Liverpool defence that was in desperate need of it last term.

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One area in which Manquillo does fall down is his passing accuracy, which has just a 72% average - far lower than many of his Atletico team-mates and something that Rodgers will certainly want to work on in order for the youngster to fit into Liverpool's style of play.

The fact that Liverpool have basically secured themselves a "try before you buy" deal with Atletico is both excellent business for the Reds and eyebrow raising stuff from Diego Simeone.

The loan agreement effectively takes the risk out of the deal, allowing Rodgers and his coaching staff a first-hand look at the 20-year-old before deciding whether the (relatively low) £5m fee is worth paying.

This is a player that is very highly rated in his home country. He's a player that Atletico don't particularly want to lose and one that Real Madrid wanted back. He's a player that Arsene Wenger wanted to help replace the departing Bakary Sagna and a player that has represented Spain from under-16 level all the way up to under-20.

Javier Manquillo may be the least known of all of Liverpool's summer business. And he may sneak into Anfield without fanfare and in the shadow of compatriot Alberto Moreno.

But it could just be the best piece of business that Rodgers has done all summer. Just don't tell Atletico.