Defence comes from coaching, personnel is secondary. Get Jardim or Simeone in, bring in maybe another experienced stop gap with them. Get Soyuncu or better yet Diallo, talented kids with a low price tag especially the latter could become our new Touré
Replacing Cech comes next. Oblak and Allisson would be perfect and worth actual 15 points a season, too expensive for our stingy board though. Lots of good alternatives in Germany, I'd go for Hradecky who's as good a shot stopper as anyone in Europe, great command of the box too. Shit distribution although it's gotten better recently, big bonus is he's a free agent.
Next is CM. Go all out for Ndombele, covers as much ground as a full three man midfield and would be the perfect partner for Xhaka. Sell Ramsey to fund him, he's not extending and he's inherently flawed anyway as much as he brings to the team our balance is always off when he's on the pitch.
In attack we need mostly backups if we're playing 4-4-2. I'd take a punt on someone young and cheap with potential like El Haddadi especially if we're as broke as we're reported to be, otherwise try and go for Guedes.
-----------Oblak
Bellerin-Mustafi-Diallo-Kola
Özil-Ndombele-Xhaka-Mkhitaryan
---Aubameyang---Lacazette
Bench: Ospina/Cech, Mavropanos, Chambers, Monreal, Wilshere, RB backup, Gbamin, Elneny, AMN, Iwobi, Perez