User blog comment:Bluefox87/One piece x Fairy tail crossover/@comment-76.161.172.226-20150130220312

As Miskos said, they run in different magazines, owned by rival publishers. The circumstances that allowed One Piece to crossover with Toriko and Dragonball just simply don't apply to Fairy Tail. A crossover between Fairy Tail and anything that runs in Shounen Jump is something you can count on it never happening.