OK So I've worked out the Yellow Triangle Saga FINALLY!!

[James Smith]

I've never put player out of his position. There's 22 places in every team. In my team there's no empty places and half of my players are able to play multiple positions (eg.cb-dmc). I'd rather buy new player to cover certan positon than put there player who shouldn't play it.

Unfortunately I don't really have the option

It shows you this when you go to move the player. Curent elligible positions have a green background in that box, slightly OOP have yellow and bad positions have red if you place them there.

OK this is cool too, I didn't know this. Thanks for the info.