Best way to have a 7 star team

[Spartan117]

3 to 4: no clue
4 to 5: 40 green
5 to 6: 60
6 to 7: 100

real top class supposedly few less, like 35; 50 etc. i haven't had that yet.

It all depends on if your player is a fast trainer. But you can never train a 4 star player to 5 stars with just 40 greens no matter how fast he trains, nor can you train the rest with the number of greens you mentioned