Soccerex’s Transfer Review took into account deals from the past four seasons.
And the study reveals that Manchester United and Liverpool are two of the biggest offenders when it comes to bringing in the wrong players.
Angel Di Maria and Christian Benteke are two examples of players who moved to the north-west for huge fees but failed to impress at their clubs.
So which other signings take an unwanted place in the top 10?
Click through the gallery above to find out.