using real names / images in a board game
Images tend to be copyrighted. You'd have to take into consideration both the rights of the photographer, and the depicted person. I'd expect you would have to get both the player's and the photographer's permission to use the images. That permission will most likely cost you a lot of money, especially for people like Messi.

You should probably just read this Wikipedia page about photography and the law. The biggest problem is that copyright law is different in each country. Depending on where you are and where your game will be made available, you'd need to simultaneously comply to a bunch of different countries' copyright laws.