You have to buy players for the defense. Buy Fabio Coentrao, Giorgio Chiellini, Gareth Bale, Davide Santon, Bakary Sagna.
And with that money you can buy the best wonderkids of the game, for example: Neymar, Lukaku, Phil Jones, Nuri Sahin, Mario Gotze, Mario Fernandes (Gremio), Lucas Digne, Dennis Appiah, Erik Lamela.