"On the one hand, I am glad to see Eto'o has gone to Inter because he has been a nightmare for us," said Casillas. "He is destined to become the best in Italy.
"Zlatan Ibrahimovic is great and at any time he can create danger, but he is a different player and is nothing like Samuel."
Casillas also dismissed reports of Cristiano Ronaldo living it up at Madrid's nightspots.
"He is very professional. It seems silly to accuse him of going out at night because he has worked harder than anyone from day one and is very well integrated," said the keeper.