Liverpool has made defender Dejan Lovren its third signing from Southampton in the summer transfer window.
The Croatia international follows midfielder Adam Lallana and Rickie Lambert into Anfield.
The 25-year-old center back said Sunday: "I know we have millions and millions of supporters -- Liverpool is more than a club."
Manager Brendan Rodgers views Lovren as "commanding and powerful presence" in defense, adding that he "clearly has leadership skills."
Contract details weren't provided.