That'd be a colossal waste of money. We don't even need 7 players.
-RB cover for Rafael
-CB to replace Vidic and perhaps Rio that might be going
-LB to replace Evra
- 2x CM to improve our midfield options( Cleverly, Fellaini aren't good enough, Carrick isn't good enough anymore)
-2x Winger to improve our options because Young, Valencia and Nani don't cut it anymore
That is basically what we need, that is 7 players. Ofcourse we don't have to bring them all in at once, can be spread over more than one window and certain problems could be resolved without bringing new players but by promoting from within.
Highest priority are:
-2x CM
-LB
-CB
We really can't go on whithout those next year, that is atleast 4 new players (for example Shaw, Carvalho, Rakitic, Rami). Anything less than that would be a failure of a summer, considering how so many players underperformed this year and that we'll see alot of outgoings.
Next are:
-Winger
-RB cover
RB cover we can solve by promoting Varela or by reverting to playing Jones, Smalling or Valencia out of position.
Winger, we have enough people for that position, but if Nani goes wouldn't be a bad idea to bring in an additional players, which could make it 5 new players. I don't think we have any youth players ready to step up for that winger position, perhaps Bébé who is doing good in Portugal, but that would be a big risk. If need be we can also just get around with Valencia, Young, Januzaj and kagawa, Welbeck, Mata who can do a job on the wings. Is a postion we can deffer to another window.
then:
-A second winger
Only need one if we clear out Young and Valencia which doesn't seem likely but could happen in one of the next windows, is a role that can be deffered.
Maybay one last position is that of a striker, currently absolutley no need, but if Hernandez goes, wouldn't be a bad idea to replace him, can perfectly do that by promoting Wilson however. Won't need another big signing unless RVP goes, and that doesn't seem likely.
3-4 signings is the bare minimum
We'd do well to get about 5 maybay 6 players
7 seems unlikely however