The 1-0 result sets them up for tonight's Champions League clash with Otelul Galati.
Ferguson said: "There are two things about Saturday that come to mind. First, Everton on their own ground against Manchester United is always a tough game. And secondly, in the second half they were playing into their favourite end and it was very difficult to handle.
"They kept pumping that ball into the box and you have done well not to lose a goal."