5. Marouane Fellaini
Although it’s been only one year since Fellaini’s £27.5million deadline day deal from Everton, the transferred epitomized Manchester United’s worst ever season in the Premier League era.
United have just lost Sir Alex Ferguson for the first time with David Moyes replacing the legendary Scot, and fans expected to see Moyes spend big in order to challenge for the Premier League title once again.
But Moyes was over-cautious, before using a massive £27.5million to bring his former midfielder, who went from double digit league goals with Everton to none last season.
The powerful Belgian still has time to redeem himself under new boss Louis van Gaal, but many have already labelled him the biggest transfer flop of 2013-2014.