Hi Manu,
thank you for your great work. I'm enjoying TE4 and I like the physics and game play very much.
Here my suggestion:
It would be a nice option to allow to spend its money prize either for some decorative stuff or even to have the option to buy with the money a coach or physio.
for the coach or physio there would be many possibilities. E.g. the coach would be able to give for a single game a boost to one stat category (like giving the player a hint how to play better against the opponent).
For the physio of course the classic options.