It seems that we are not just going to sell deadwood (Darmian, Rojo, Bailly?, Valencia, etc), but also we could lose some players that normally play in the first team and squad players (De Gea, Pogba, Herrera, Martial, Mata, Lukaku).
That's why we need to sign the best available players we can get.
Koulibaly. He would be the best considering De Ligt doesn't want to join us.
Cancelo. IMO he's better than Meunier and Wan Bissaka, Juve want to sell him.
Eriksen. If Pogba goes to Madrid, he would be the best replacement. City don't need him (they could sign Fernandes and a CDM), Madrid would spend in Pogba (and Hazard), Juventus and Bayern won't spend too much for him in his last year of contract, so, he could be an option.
Dybala/Felix. If we are going to lose Mata, Martial, Sanchez and Lukaku, then we need a talented attacker. Both players are available.
Pepe. I would prefer Sancho, but it seems that he will stay at Dortmund.
Then just sign a young GK or play Romero, and another young midfielder.
We could get 300m+ if we sell De Gea, Pogba, Martial, Lukaku, etc. So it could be possible to get those players. That would be if we want to compete versus the bigger teams. If we want to be the new Liverpool, the sign Manolas, Maguire, Trippier, etc.
Romero
Cancelo - Lindelof - Koulibaly - Shaw
Fred
N'Dombele - Eriksen
Dybala
Pepe - Rashford