There's just too much work to wishlist over the next two transfer windows.
I would spend £40 million on Mats Hummels, £60 million on Edinson Cavani and £30 million on Sami Khedira. Sell whoever you have to in order to fund those transfers and take it from there. Cazorla would be a good candidate since his name still has some credibility in Spain. Time to recoup his transfer fee. Rip up the contracts for Rosicky, Diaby and Flamini - all they do is cost money. Get rid of Sanogo and Campbell. When all this is done, let's start on the squad. Find someone better than Szczesny; it honestly shouldn't be that hard. There are a ton of keepers in Europe who don't get beaten by the first shot on goal in every game. Get a real leftback. Get a real rightback. Hell, let's bring in a winger too because we only have one in Walcott who's good enough - and he got injured again before he even made his first start in 2014.
If we fix these minor flaws we have a real possibility of challenging for the league and Champions League next season. It just takes £300 million, a new manager and 10 new players. I can't even be fucked thinking about it. We're years away.