9. Mario Balotelli (Inter Milan to Manchester City £24m)
The Italian has been a £16m flop at Liverpool, and cost Manchester City even more than that in the summer of 2010 when he joined from Inter Milan as an untamed 20-year-old.
He chipped in with his fair share of goals, and one very crucial pass, as the Citizens won their first Premier League title in 2011-12, but his time at the club will always be more famous for what he did off the pitch.
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