Sissoko for me. We've really missed a box to box midfielder, someone who can break up attacks and then quickly start one of our own Yaya Toure/Diame style.
Looking forward to seeing a lot more of Debuchy as well, such a huge upgrade on Simpson. You've got Yanga-Mbiwa as well who's just a huge upgrade on Willo, we might actually see the ball being played out of defence from the right side from now on.