0 out of 5Joan Monfort/Associated PressThe unthinkable happened. FC Barcelona announced Thursday that Lionel Messi will be leaving the club. He is widely considered the greatest player in football history after 21 unmatchable seasons.Wow. He was almost certain that despite his lengthy resigning process, he would return home to Blaugrana to continue his incredible career. It has been a remarkable 672 goals and 505 assists in 778 matches. All of this, all in the blue and maroon colors of the Catalan club.According to a Barcelona statement, it is not possible. Due to structural problems in La Liga, a contract extension is not possible. Leo will now be playing for another club for the first time ever in his professional career. This will require some adjustment.So, now comes the million-dollar question, or closer to a trillion if you look at some contract figures.Let's break down the most likely landing places for Messi. We will start with the least likely, and end with the one that makes the most sense. It's strange to announce that Lionel Messi will be leaving Barcelona. But here it is...