Liverpool over the past few years have lacked a solid defence - although Daniel Agger has been a top player for the Reds, he needs someone with a combination of experience and talent to play beside him.

When the veteran Jamie Carragher retired they required a player to step up and partner Agger. Can Mamadou Sakho be the partner Liverpool desire?

Paris Saint Germain admitted they didn't want to see the back of Sakho, but out of his hunger to play first team football, the Paris-born defender found himself in Merseyside.

Sakho joined Liverpool for a fee of around 16 million - the price tag is heavy but also indicates Sakho's ability. The 6 foot 2 defender rarely finds himself out of position and his power and strength is often too much for attackers. As a PSG player he made over 150 appearances and has participated in the Champions League: Valuable experience for a 23-year-old.

Liverpool's ambition this season is clear: They want Champions League football.

Towards the latter end of last season they proved their attack is great enough for the Champions League but questions remained about their defence. This was obviously top of their priorities, bringing in four new recruits for defensive duties.

Kolo Toure joined on a free transfer, Tiago Llori also joined and the left back Aly Cissokho joined on a season-long loan from Valencia. Liverpool's new individuals provide options at the back and should bring the best out of their players due to fierce competition.

Liverpool needed a partner for Agger but who was it to be? Martin Skrtel is not quite the partner that Brendan Rogers and Liverpool needed to assist them in to the Champions League and to move their team forward. Which is why Sakho's high profile move is so key.

A solid centre back that makes few mistakes should be an ideal partner for Agger. Given time to settle this partnership could be one of the best in the league and provide Liverpool with the stable centre back partnership they need, to make it in to the top four.

So when defensively Liverpool were more comfortable they switched their attention to how they should play and who should occupy which role. Liverpool's most favored formation appears to be the 4-2-3-1 formation opting for experience with the defensive midfielders, often using Steven Gerrard and Lucas Leiva.

Then further forward exploiting the pace of Victor Moses on loan from Chelsea, Iago Aspas another summer signing and Brazilian playmaker Phillipe Coutinho. Coutinho, however picked up an injury in their game against Swansea. This certainly affected the Liverpool side as Southampton put a stop to their unbeaten streak after they defeated Liverpool 1-0.

Although Liverpool did lose to Southampton their start has been one of the best having picked up 10 points from five games. Up top Liverpool have used Daniel Sturridge who in the first few games has been some what of a goal machine, filling in for the banned Luis Suarez.

So with plenty of attacking threats, the team starting to gel and depth in the defence; this has to be the recipe for success at Liverpool Football Club.

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