4. Mario Balotelli
The Italian striker has undoubted ability, but how best to extract it? World-class managers such as Mancini and Jose Mourinho may go to their graves pondering the answer to that particular question.
The only reason that Balotelli does not feature higher on this list is because he has been sussed out. He did not make the grade at Manchester City, and has not either at Liverpool. His reputation is certainly on the wain after his disastrous move to Anfield and may never recover.
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