The winter window is now closed and Barcelona, Arsenal, Liverpool and Man City are among those who have spent big. While a few clubs have gone ahead and splashed the money to rescue a dismal situation, there are those who have spent to consolidate their position in their respective leagues.Alexis Sanchez, Virgil van Dijk, Pierre-Emerick Aubameyang and Theo Walcott are the players who made headlines as they made the move in and around England. Phillippe Coutinho also made a few headlines after he made a massive money move to Barcelona at the beginning of the window.These transfers across Europe has certainly made this perhaps the most lively window in the history of Winter transfer seasons.So, we are here with a list of 10 most expensive transfer of this January.10. Guido Carrillo: Monaco to Southampton, £19.1 mThe Argentine will be keen to make an impact with The SaintsThe 26-year-old Argentine frontman has agreed on a three-and-a-half year deal at St Mary's until 2021 and has expressed his delight at reuniting with Saints boss Mauricio Pellegrino with the latter making an attempt to add some firepower to his misfiring front-line.He was a Ligue 1 title winner alongside Kylian Mbappe and Radamel Falcao at Monaco. Carrillo has made 22 appearances this season but just two of them have been starts in Ligue 1. He scored 20 goals in over 50 appearances for Monaco since signing from Estudiantes in 2015.#SaintCarrillo! 😇Welcome to #SaintsFC, @carrilloguido11! pic.twitter.com/WALO7qUXls— Southampton FC (@SouthamptonFC) January 25, 2018