Fullback Sergio Ramos hit the only goal of the game and Schuster said afterwards: "If we talk about the four at the back, they have been sensational in every game. They are saving us.
"I have already said a couple of times that I do not like the attitude of the four in front of them. That is where teams are creating problems for us.
"Once again (Fabio) Cannavaro and Sergio have saved our lives. The line ahead is where the opponent must be stopped."
Schuster admitted: "At the moment we're winning games without playing well. The form can be debated later, but now the intention is to win and hope to play more entertaining later."