Soldado is the one that shouts out at me as being a sound bit of business, a replacement for Villa. He's obviously not as good but he's still a very good La Liga player.
Feghouli for nothing could turn out to be a coup, he is highly rated. Topal impressed me when I saw him play for Turkey also.
The most important thing for them though was despite losing the big two they managed to keep Mata, Pablo Hernandez and Banega. Add to that the likes of Vicente, Joaquin etc and they've still got a very solid side.