If this saga of selling the club goes on all through the summer, I can see a worst case scenario of two bought players only coming in, probably just before the season starts and no pre season, maybe a free transfer or two. One will definitely be a striker and the other will be a goalie if De Gea goes, or a midfielder if he stays.
I say this, because worst case is we have £100/120 mill spend as Maguire McTom Fred Bailley Telles all stay due to wages and probably Bailley and Telles go out on loan again. Henderson is the only guarantee we have for a sale as he actively wants to leave, but Forest wont want to pay more than £20 mill for him. VDB may go as well, but who will be paying more than £10 mill for him, as his career has gone backwards since he left Ajax.