8 star player to a 9 star player?

23/10/16 02:37
Lets say I have a 8 Star player but I want to train him to a 9 star player etc etc...

There is now way of telling when or how he will turn into that 9 star player at least on the Mobile app..
How do I know what stat point I need in order to boost this player up to the next star rank..
24/10/16 13:36
The stars number is the average of the 22 skills levels.
Click on the player to see in details all attack, defense and physical skills.