Here's an interesting topic of discussion. The CIES Football Observatory is a research body that is related to FIFA according to the article where I found this.
In any case, the leagues have already, or will in due time, release their own Best XI. This was taken from an independent body and they took a bunch of criteria into consideration.
Thoughts? Any dire omissions or undeserving selections? Also, post your own Best XI for any leagues and see how it stacks up.