Dowell will be staying and will have a role in the first team, as well as sandro I'd imagine.
The rest can go
Can't see it
Sandro will be 4th behind Tosun/Niasse/DCL up front
In terms of attacking mids/wingers, Richarlison, Bernard, Walcott, Lookman, Siggy, Gomes
We've not got Europe, so genuinely can't see either of them getting any minutes. They might be on the bench for a few early games whilst signings get up to speed but that's about it