How to call methods in player from gameManager

This question might sound bit daft, but its driving me insane. Whole unet system is so overcomplicated that its hard to wrap my head around it, everytime I feel like I understand how it works, it just wont work.

I have GameManager class which is supposed to overseer the game, technically it cant modify other players, which is pain in the ass by design.
So I moved methods that should be in controller to player class, and all I want to do is to trigger them, yet on remote client they wont,...

How to call methods in player from gameManager