Mario Balotelli
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The controversial forward was hyped up for great things at Liverpool, but didn't provide the goods after a huge transfer move, disappointing many fans. In total, he only played 16 times for the Reds, when many hoped he could form a partnership with Daniel Sturridge when he signed in 2014.
Balotelli was finally sent out on loan in 2015 to AC Milan, making 20 appearances for the Serie A giants, but only scoring one goal.
Now transferred to French club Nice, Balotelli has somewhat revived his career, appearing 55 times and scoring 33 goals.
Starting for Italy against Poland in the new UEFA Nations League, Balotelli is on the way to recovering his world-class form. At 28, he is now entering the prime of his career.