I think it could be done in 2 years possibly. Sancho RW and a top class midfielder should be prioritised at first. Hannibal Mejbri will also be given the opportunity to stake a claim for one of those midfield positions in the next 12 to 18 months. Bruno I think will be signed in the current window as the #10. That leaves us needing a LB and Striker which can be added to the squad in a very economical way if we adopt a sensible approach.
Bruno Fernandes - #10
Hannibal Mejbri - CM
Jadon Sancho - RW
Top class - CM ?
Tagliafico - LB
Striker - ??
Then we also have the likes of James Garner, Dylan Levitt and a few more who will solidify the midfield and other positions. We can do this in a very cost effective way without throwing too much money at it if we plan ahead.