I think realistically this is the most likely to happen;
OUTS
Kolasinac (loan)
Mustafi
Sokratis
Saliba (loan)
Chambers (loan)
Plus a few more youngsters out on loan
INS
1 creative midfielder, most likely a loan e.g. Isco
Experienced back up keeper, would probably need to be British
The young CB from Berlin
Can't see Ozil budging, seems quite content to sit on his contract until the summer.