For what it's worth, my take on it is...
Desired outgoings - Janssen, Vorm, N'Koudou, Llorente (probably)
Outgoings against our will - Alderweireld, Eriksen
'Painful' outgoings to improve the team - one of Dier/Wanyama, one of Trippier/Aurier, remote chance of Davies
Now, it's not like all these need replacing given how much Poch has ignored some of them (see: N'Koudou and Janssen), but there could definitely be a substantial recruitment job if Toby and Eriksen end up going.
Essential incomings - new RB, new CM
Incomings if Toby and Eriksen leave - new CB, new CAM
Smart additions if we want to improve - new CAM anyway (even if Eriksen stays, we need an alternative like Grealish to keep him on his toes and prevent burnout), a new striker who can come on for Kane at 70 mins if required.
So really it could be anywhere between 2 and 6 incomings (maybe more if we buy some prospects), and I think the club would do well to be bringing in closer to the latter number than the former.