I'm probably the only person on the planet to think this but I want Torres here, I feel he would do a lot better in our system than in Chelsea's, his level of ability is perfect to compete with Giroud, he's old enough so that when he retires Sanogo will be ready to step in, he's actually decently pacy, wouldn't be lonely due to the Spanish chemistry with Cazorla, Arteta, and Monreal, and he would hopefully not cost too much with Chelsea looking to offload everyone, although I doubt Mourinho would be excited to sell to a direct rival. For defense I have no idea who I'd want, the right back position is so weak right now, barely any world class players, and with other clubs like Barca looking at the few available right backs it's going to be really hard if Sagna leaves. Maybe sign someone who is just decent and hope Jenkinson gets to the required level, but...
For midfield, I wouldn't really want a "destroyer" type player, and there isn't any out there that are available who particularly catch my eye, ideally we would get someone who plays like Arteta but has legs. Diaby is always an outside bet but with his injury record can't rely on him at all. I think it would be neat to lodge a cheeky bid for Henderson, as him and Ramsey would be the sexiest midfield of all time, but Liverpool would have no reason to sell. Schneiderlin maybe, haven't really watched him so I don't know how good he is though.