The 25-year-old has signed a long-term deal with the Reds after Liverpool agreed a £20m deal with Southampton.
Here is the best of the Twitter reaction from the professionals, past and present, to Lovren’s switch.
Former Liverpool striker John Aldridge (@Realaldo474) is delighted to finally sign the Croatian centre-half: “Lovren signs!AT LAST.How long does it take these days to sign a player???it used to be 2/3 days to tie it up!!Does my head in.”
Tennis star Jamie Murray (@jamie_murray) is worried for the Saints’s threadbare squad: “Do southampton have any first team players left? @joshcmurray #exodus #championship”
Manchester United defender Luke Shaw (@LukeShaw3) congratulates his former team-mate: “@DejanLovren05 congratulations mate , you deserve it! All the best. I will see you soon”
Prompting a reply from Lovren (@DejanLovren05): “@LukeShaw3 thanks bro”
Former England bowler Graeme Swann (@Swannyg66) draws up Southampton’s wishlist: “Surely Southampton have enough money to buy messi and Ronaldo now?”
Finally, the man-of-the-moment Dejan Lovren (@DejanLovren05): “I just signed a contract with one of the biggest club in football history, the great #LiverpoolFC !!”
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