Liverpool have confirmed the arrival of experienced defender Ragnar Klavan from Bundesliga outfit FC Augsburg. The uncompromising and dependable centre-back is believed to have put pen to paper on a three-year contract at Anfield, becoming the fourth signing made by manager Jurgen Klopp this summer.

Although no official fee has been disclosed, Sky Sports claim the deal is worth approximately £4.2m ($5.5m). Klavan, who has amassed 112 senior international caps during his career to date, will become only the second Estonian ever to ply his trade in the Premier League, following former Portsmouth, Derby County, Sunderland, Arsenal and Watford goalkeeper Mart Poom.

Speaking after the switch was announced, Klavan told Liverpool's official website: "I'm really honoured to be part of this amazing club, this amazing team. It's hard to put it into words, because it's been a dream of mine for 22 years to come to the Premier League and be a part of this amazing club, Liverpool.

"The Premier League is the most attractive league in the world and you always have amazing players here. This is the home of football."

Klavan made 140 appearances across all competitions during a four-year stint at Augsburg after moving from Eredivisie side AZ Alkmaar in 2012, and featured for the entirety of both legs of Die Fuggerstadter's 1-0 aggregate Europa League last-32 defeat to Liverpool in February. He has also previously represented Heracles Almelo and Norwegian top-flight club Valerenga, as well as Estonian trio Flora Tallinn, Viljandi Tulevik and FC Elva.

The 30-year-old joins former Schalke stalwart Joel Matip as the second central defender signed by Klopp in recent months, with the manager instigating a mini overhaul in that area. Kolo Toure was released at the end of his contract in June and the long-serving Martin Skrtel was sold to Fenerbahce in a £5.5m deal last week.

Mamadou Sakho, while recently cleared of a doping charge by Uefa, is expected to miss the start of the new campaign after a recurrence of an Achilles injury, and long-term absentee Joe Gomez has suffered a setback in his recovery from a ruptured anterior cruciate ligament. Tiago Ilori, meanwhile, has been named in Portugal's squad to compete at the Olympic Games in Rio de Janeiro next month. Matip was also sent for a scan on an ankle problem sustained during Sunday's 2-0 pre-season friendly win over Wigan Athletic, leaving Klopp with something of a crisis at the back.

Highly-rated young German goalkeeper Loris Karius and exciting forward Sadio Mane are the other players to have joined Liverpool during the current transfer window. January signing Marko Grujic has also returned from his loan spell with former employers Red Star Belgrade, while Jose Enrique, Jordon Ibe, Jordan Rossiter, Sergi Canos, Samed Yesil and Joao Carlos Teixeira have all departed.