3 year contract?
Summer 2016:
Pay Antoine Griezmann's buyout clause before the European Championship - £58 million.
Overpay for İlkay Gündogan to avoid competition before the European Championship - £30 million.
Overpay for Rúben Neves before the European Championship - £25 million.
Activate Aymeric Laporte's buyout clause during the European Championship - £34 million.
Negotiate for Zlatan Ibrahimović with Mino Raiola during the European Championship - Pay top wages for 3 year contract, and a fat signing bonus.
Negotiate for Ever Banega - Bosman.
Acquire Alvaro Morata in swap deal *.
Negotiate for Samir Handanović - Bosman (best deal of the summer - been excellent for Internazionale - 11 goals conceded in 17 games).
Sell Wayne Rooney for whatever.
* Sell David de Gea for Álvaro Morata (Madrid will buy him back from Juventus for us) + £25 million.
Sell Michael Carrick.
Keep everyone else.
Sell Juan Mata for whatever.
Net transfer spend ~£90 million (assuming £30 million for Rooney and Mata combined so conservative estimate).
Squad:
Keepers:
Samir Handanović + 1.
Defenders:
Matteo Darmian, Antonio Valencia,
Chris Smalling, Phil Jones (last year warning),
Aymeric Laporte, Marcos Rojo,
Luke Shaw, Daley Blind.
Midfielders:
İlkay Gündogan, Andreas Pereira,
Morgan Schneiderlin, Ever Banega,
Ander Herrera, Bastian Schweinsteiger, Rúben Neves.
Forwards:
Zlatan Ibrahimović, Álvaro Morata (build him up as Zlatan's successor and play him as his relief, as well as wide in rotation),
Anthony Martial, Memphis,
Antoine Griezmann, Adnan Januzaj, Ashley Young, James Wilson.
Starting XI:
Flip to 4-3-3, and rotate the squad frequently to give more experience to younger players.
Winter 2016:
Buy Leon Goretzka for £25 million (train him behind Fußballgott as a deep lying playmaker/ defensive midfielder).
If Darmian's attacking play doesn't improve, buy João Cancelo for £20 million.
2017:
Starting XI is largely the same as the previous season, but start giving more time to the younger players.
2018:
Younger players ready to step up into starting roles after 1-2 season worth of experience.
Starting XI:
Average age of outfield players ~24 years - a lot of them are going to enter their prime; and net spend of around £140 million. Add a couple players each season to improve squad, and 2 young player (16-18 yrs) on top of that to develop into first team starters/ squad options. If Academy players are good enough, play them - but don't obsess over it if the quality isn't there. Maybe try to scout better local youngsters in liaison with the scouting department to build for the future.