Last year Kante's whoscored rating = 7.6, and Mahrez = 7.7. There are 30 players in that database with ratings equal or better than them. Let's call them "world class", for want of a better term. They are distributed as:
Paris Saint Germain --- 4
Barcelona -------------- 3
Real Madrid ------------ 3
Arsenal ----------------- 2
Bayern Munich --------- 2
Juventus --------------- 2
Leicester --------------- 2
Atletico Madrid -------- 1
Augsburg -------------- 1
B. Dortmund ---------- 1
B. M.Gladbach -------- 1
Lille -------------------- 1
Napoli ----------------- 1
Nice ------------------- 1
Rennes ---------------- 1
Southampton --------- 1
Tottenham ------------ 1
West Ham ------------ 1
Zenit St. P'burg ------- 1
This year we should pick up 2 of them from Leicester, for cash or part-exchange for whomever they want from our midfield, one of them from PSG. One from Southampton (ideally in part exchange for Smalling); and possibly: Sofiane Boufal from Lille. The other 25 are almost certainly out of reach, or too old. That will give us 5 of the "best" 30 players (based on stats). It's as good a way as any to build a team. That top 30 lot performed last year. If they can do it again we have the title.