they are more intelligeent than footballers for sure
I'll speak for both types of Football, the one here in the states and the one on the other side of the planet.
In the United States, there are actually quite a few football players with University degrees up to a Master's. Chess players thereby may be considered inherently smart, which may or may not truly be the case, where many sports players appear to be foolish or idiotic but may indeed be quite intelligent.
Anyway, I assume every single person is a complete idiot until proven otherwise.
Instead of elaborating on whether (master-level)chessplayers are inherently intelligent in the psychological sense, it seems more rational to suppose that they are intelligent as such and compare them to other categories of gameplayers, so that we realise in the process whether their intelligence is considerably transferable to domains that mainstream society values highly.