How important is IQ/EQ in football?

How important is your average intelligence in the modern game? And I am not talking just IQ, but EQ too. I remember reading somewhere that Frank Lampard had a very high IQ and you can see how he is not just a player with skills but is also a thinking footballer. Able to translate manager's instructions well, reads the game, and always comes across as someone with a good temperament. It is no surprise he is doing quite well with Derby.

So for example, if you have someone with ridiculous...

How important is IQ/EQ in football?