The winter transfer window is almost here and clubs are looking to strengthen their squad in order to challenge for top honours.The Reds wasted no time in securing their first winter signing after Virgil van Dijk was officially announced as a Liverpool player. He has now become the most expensive defender after both the clubs, Liverpool and Southampton, agreed on a deal of £75 million. The Netherlands international will join Liverpool on the 1st of January and will wear the No. 4 jersey.As always, Twitterati couldn't contain their excitement. We bring you some of the best tweets.Liverpool Football Club can confirm they have reached an agreement with Southampton for the transfer of Virgil van Dijk.Full story: https://t.co/tJy9vsGOen pic.twitter.com/L17A7UwqaU— Liverpool FC (@LFC) December 27, 2017 Delighted and honoured to have agreed to become a Liverpool FC player! ??? Today is a proud day for me and my family as I join one of the biggest clubs in world football! I can’t wait to pull on the famous red shirt for the first time in front of the Kop and will give everything I have to try and help this great club achieve something special in the years to come ?? I would also like to take this opportunity to say thank you to Les Reed, the board, manager, players, fans and everyone at Southampton. I will always be indebted to the club for giving me the opportunity to play in the Premier League and despite a difficult last few months I have thoroughly enjoyed my time at Saints and have made friends for life at the club. Thank you for everything ?????? Thank you for all the messages of support ?? I’m now looking forward to meeting my new team-mates and getting started ? #YNWA A post shared by Virgil van Dijk (@virgilvandijk) on Dec 27, 2017 at 10:08am PSTLiverpool have won the race to sign Virgil Van Dijk for £75mil despite from the whole summer up till December to trying to avoid selling to us. He joins along with former Southampton players Mane, Lovren, Clyne, Lallana and Chamberlain. Unlucky.pic.twitter.com/Aos8OOHpqF— SamueI (@VintageSalah) December 27, 2017Liverpool fans would definitely hope this is not trueThe reported transfer fee is mad, but it definitely suggests that Klopp is being fully backed. Up to £66m spent on Keïta and now another £75m for van Dijk.Really exciting times ahead. Let's just hope that these transfers aren't directly funded by a future Coutinho sale, though.— ^ (@Koloholic) December 27, 2017That's another way of looking at itIf signing Van Dijk means that Dejan Lovren never partners Joel Matip in central defence ever again then £75m is a bargain.— Paddy Power (@paddypower) December 27, 2017BREAKING: Liverpool have agreed a deal to sign Virgil van Dijk from Southampton for £75M. ??Liverpool fans right now...? pic.twitter.com/w44xtcp3ah— SPORF (@Sporf) December 27, 2017The transfer fee makes much more sense now£75m sounds a lot for Virgil van Dijk, until you consider Liverpool are set to get 50% off. pic.twitter.com/MYYUwlekwL— Coral (@Coral) December 27, 2017Let's just hope this is falseVirgil Van Dijk plot twist @LFC pic.twitter.com/AbastTbqYH— Deluded Brendan (@DeludedBrendan) December 27, 2017From one home to anotherVirgil van Dijk had the option of Choosing Manchester City and winning the premier league title in May but instead he has decided to follow traditions and join former Southampton teammates at Liverpool.— Danny Welbeck (@WelBeast) December 27, 2017Challenge acceptedVirgil van Dijk: I hope to come to Anfield, shore up the Liverpool defence and prevent the team collapsing under pressure.Mignolet: Challenge accepted.— Paddy Power (@paddypower) December 27, 2017Stats of the £75 million defenderLiverpool have confirmed the signing of Virgil van Dijk from Southampton -- How excited for this are you #LFC fans? pic.twitter.com/ztQCiCq1cJ— WhoScored.com (@WhoScored) December 27, 2017Liverpool and Southampton...a better love story than Twilight? Liverpool players signed from Southampton:? Van Dijk = £75m? Mane = £34m? Lallana = £25m? Lovren = £20m? Clyne = £12m? Lambert = £4m ? Total Investment = £170m pic.twitter.com/grMHQC9f9b— SPORF (@Sporf) December 27, 2017It's never too lateLiverpool would have saved themselves some time and money if they had just bought Southampton Football Club outright a few years ago.— Paddy Power (@paddypower) December 27, 2017Mourinho looking to spend more money after saying that £300 million was not enoughJose Mourinho at Ed Woodward's when he heard about Liverpool spending £75m. pic.twitter.com/RxZkt5iT4j— Coral (@Coral) December 27, 2017