AS Monaco (£147 million)

Radamel Falcao of AS Monaco celebrates his goal during the french Ligue 1 match between FC Girondins de Bordeaux and AS Monaco FC at the Stade Chaban-Delmas stadium on August 10, 2013 in Bordeaux, France. (Photo by John Berry/Getty Images)
Enjoying their first stint in Ligue 1 after a while, AS Monaco were expected to spend big. But nobody could have foreseen what happened. Whilst all of Europe was fighting for the signature of Radamel Falcao, including the likes of Chelsea and Manchester City, Monaco pipped all of them to land the Colombian and signal their intent to all of Europe.
Alongside the Colombian are his international teammates James Rodriguez and Joao Moutinho from Porto, and a few other soon to be influential Frenchmen in Jeremy Toulalan, Geoffrey Kondogbia and Eric Abidal. They spent close to £150 million on new players this window, and have certainly created quite a stir.