If you look at the age of the players we brought in...
Richarlison 21, Mina 24 ,Zouma 24, Digne 25, Gomes 25, Bernard 26.
They're all around the same ball park with Richarlison slightly younger.
Considering their ages when we get to the summer then Tosun at 29, Niasse 29, Walcott 30 and Morgan 29 will all be gone. The exceptions are probably Coleman who will stay because of his stature at the club whilst Sigurdsson has enough talent that he'll stay too, unless someone tables a big bid which is unlikely. Jags and Baines will leave on their own accord and Stekelenburg will stay until he's 75 which should take us to 2022.
Vlasic is probably the only player we try to keep who is out on loan.
We'll shift McCarthy as well, probably to Celtic on loan.