According to this...
http://www.fifa.com/clubworldcup/news/newsid=570740.html
If a Japanese club wins the ACL, then the runners up of ACL will qualify as they dont want two clubs from one country.
http://www.fifa.com/clubworldcup/news/newsid=570740.html
If a Japanese club wins the ACL, then the runners up of ACL will qualify as they dont want two clubs from one country.