Real have so far this summer made several massive signings such as Kaka from AC Milan for £56million, Karim Benzema from Lyon for £42million and Cristiano Ronaldo from Manchester United for a world-record £80million.
Fergie said: “I don’t know how their manager Manuel Pellegrini plans to pick his side because it has no balance.
“I told Ronaldo before he left that he will end up playing centre-half because I don’t think they have one!”
Fergie added: “I don’t envy Pellegrini picking his team.”