When any club looks to sign a new left-back, one of the first things they should consider is whether they can actually defend.
Signs suggested that Liverpool had made such considerations in 2014, yet after nearly 50 Premier League appearances for the club, Alberto Moreno remains a liability in defence and continues to cost the Reds points.
Last season, Brendan Rodgers often fielded three centre-halves and deployed Moreno as a left wing-back, allowing the Spaniard freedom to focus more on attack and less on the defensive side of his game - a position in which he seemed to thrive.
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When played at left-back, however, he often looks a fish out of water. During a 3-1 loss against Manchester City last season he was held responsible for Stevan Jovetic’s opener after failing to clear his lines.
Later in the campaign, Moreno was caught out of position for both of Juan Mata’s goals at Anfield, as his international teammate found space in behind him and fired Manchester United to a 2-1 victory.
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After the sacking of Rodgers, Moreno spoke of his 'inner anger' at the Irishman for being left out of the side in favour of youngster Joe Gomez.
The 22-year-old said: "I perhaps felt that Brendan didn't have quite so much confidence in me, certainly at the start of this season. He told me I was training hard but then I didn't feature for those first five or six games."
From the poor defensive displays he made, though, you could hardly blame Rodgers for leaving him out. When new manager Jurgen Klopp turned to him during the club's 3-1 away win at Chelsea, Moreno once again showed his frailties.
The former Sevilla defender was caught out of position as Cesar Azpilicueta, ironically a Spanish full-back who has found a perfect balance between defence and attack, found space in behind Moreno to set up Ramires' fourth-minute opener.
Moreno appears to be yet another example of a Spaniard who grew up as a winger and shifted to full-back. He poses an obvious threat going forward due to his pace, but defensively, his ill-judgement continues to work against him.
A role further forward could perhaps be the solution, with the crocked Joe Gomez resuming his role at left-back upon his return from a long-term injury.