9) Christopher Samba (Anzhi Makhachkala to QPR, 2013)
Previously regarded as one of the most solid defenders in the Premier League, Christopher Samba was one of many failed QPR buys.
10) Kostas Mitroglou (Olympiakos to Fulham, 2014)
Arriving as one of the best goalscorers in Europe, Greek striker Kostas Mitroglou badly flopped at Fulham, with this deadline day purchase failing to save them from relegation in 2013/14.