It's called licensing. If a club or league wants too much money for the the rights to their images, trademarks, etc. then it is not economically feasible to put them in the game. (It is even less economically feasible to get sued for using the trademarks without permission.)
TIF2003 will have MFL. It will also have MLS, J-league, K-league, Argentine and Brasilian along with the top leagues in Europe. Hopefully, this game will be ported stateside. http://uk.playstation.com/features/f...T&linktype=FT3