Actually the list at club-soccer.com is bigger than Wikipedia. Also lots of teams arent even mentioned on rsssf.com (which in my opinion is the best soccer archive available).
I know that your list of soccer clubs is bigger than any other website. My concern was to provide a source about players in these "known soccer club". I wonder if the Wikipedia list is being updated regularly.
Check out http://club-soccer.com for the largest directory of soccer teams. Including teams from all continents, virtual nations, all islands, disputed territories, Non FIFA nations, enclaves and exclaves.Currently 75,000 clubs in database.