Liverpool arguably have their best squad of the Premier League era but who has been the most important signing made by Jurgen Klopp?

The Reds won the Champions League last season and posted a club high 97 points in the Premier League as they finished second in the top tier.

It was an agonising campaign in many ways as Klopp's men failed to win the league crown after showing so much promise throughout the season.

However, Liverpool are planning to battle tooth and nail again this time around but when it comes to which player has been the best acquisition in recent times, club legend Jamie Carragher believes he has the answer.

Liverpool stars Mohamed Salah and Sadio Mane shared the golden boot last season with Pierre-Emerick Aubameyang, but the list of top performers at the Reds goes on with the likes of Alisson, Virgil van Dijk, Trent Alexander-Arnold, Andy Robertson and Roberto Firmino all standing out in their respective positions in the last twelve months.

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For Carragher, the man who is the most important out of that list is Mane, with the forward on a par with former Liverpool star John Barnes according to the ex-Reds' defender.

"You could make a strong case obviously for Mohamed Salah, Virgil Van Dijk or Alisson following the incremental improvement that has coincided with each of their arrivals," Carragher explained in his column for the Daily Telegraph.

"But I still maintain that the correct answer to this particular question is Sadio Mane.

"So how do you define 'world class'? I judge it by thinking about a fantasy world starting XI and whether any given player would either get straight into the team or at least be in the best two or three in the world in their position.

"As left-sided attackers I would rate Mane, Raheem Sterling and Eden Hazard as currently the best, especially now that Ronaldo has become more of a striker and the struggles of Neymar since the World Cup.

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"I also think that Mane is Liverpool's first genuinely world-class winger since John Barnes and the club's best wide left player for almost 30 years."