Ferdinand said: “A lot of the lads had not played for a while, Gaby (Heinze) has not played for almost a month and there are a lot of lads who have not been playing regular football and that shows the depth we have got in the squad at the moment.
“To come here, which is a difficult place, a bad pitch, is hard, but we started great and all in all we are through and we are happy.”
Manchester United will face Middlesbrough in the last eight in the UEFA Cup.
He added: “Wembley is a new stadium this year, I have played at the old one and it would be great to be one of the first players to play there in the new one.
“The aim is to win as many games as we can towards the end of the season and if we do that then we will be there or thereabouts in all the competitions.”