Chris BurtonCoutinho, Aubameyang and the 20 most expensive transfers of JanuaryTransfersPremier LeagueBayern MunichMonacoBarcelonaValenciaLaLigaSwanseaSouthamptonStokeBundesligaBrightonSerie ATottenhamBorussia DortmundManchester CitySuper LeagueArsenalChelseaLiverpoolEvertonLigue 1Athletic ClubThe winter window is now closed, with the likes of Barcelona, Arsenal, Liverpool and Man City among those to have spent big bolstering their ranks