Benitez said: "Ferguson is clever, that is clear. After a difficult game he was talking about referees and before an important game he is talking about protecting Ronaldo.
"The referees, though, have experience and they will know Ferguson. Treatment must be the same for all the teams and all the players.
"I just want to go into the game with the same situation as the other team."
Asked if stopping Ronaldo would be the key on Sunday, Benitez said: "Maybe stopping Torres! No, they have a lot of good players, so it will be difficult if you just think about Ronaldo. We have to think about all of them. I think he's in form but Torres is, too."