5. Krzysztof Piatek
The Polish striker enjoyed a stunning start in Italy last season by bagging 19 goals in only 21 appearances for Genoa.
Therefore, AC Milan signed him up for an incredible €38m hoping that he would become Andriy Shevchenko’s successor.
Piatek fueled these hopes by enjoying a solid start to his San Siro career. He scored 11 goals in 21 games for Milan and seemed set for better this season.
But things didn’t work out in the end, with Milan re-signing Zlatan Ibrahimovic in a desperate bid to revive their fortunes.
Surplus to requirements, Piatek joined Hertha Berlin on Thursday.