Getty ImagesMark DoyleRonaldo, Neymar & the most expensive transfers in historyTransfersArsenalBayern MunichMonacoReal MadridBarcelonaLaLigaPremier LeagueParis Saint-GermainManchester UnitedBundesligaSerie ABorussia DortmundManchester CityChelseaLiverpoolLigue 1Cristiano Ronaldo has joined Juventus for €100 million, so where does the forward rank on the list of the biggest deals of all time?