#4 Alexandre Pato
In 2009, Alexandre Pato was garnering attention from around the globe for being the latest among the Brazillian superstars to break through. He had just won the Golden Boy award and the young player of Serie A award while setting the field alight for a blockbuster AC Milan squad.
He scored 51 goals in 117 appearances for AC Milan before his chances started getting limited due to injuries, and he decided to go back to Brazil and play for the Corinthians. He struggled in Brazil as well and was eventually loaned out to Sao Paulo.
His form for Sao Paulo was patchy, but in flashes he showed what he is all about, and eventually earned a way back to Europe through Chelsea, who took the Brazilian on loan. His time at Chelsea was also hampered by fitness issues, although Spanish giants Villarreal took a risk on the international and brought him to the Estadio de la Cerámica.
He now plays for Chinese club Tianjin Quanjian, having failed to completely fulfill his initial promise.