- Angel Di Maria (£59.7m):
One of the biggest flops at the club in recent times, Angel di Maria, made a forgettable move to Old Trafford from Real Madrid back in 2014 for a then club record deal. However, the Argentine was just not able to adjust to the league under Louis van Gaal and was ineffective with returns like 3 goals from 27 games. He was offloaded just a year later to PSG who are reaping the benefits of his quality.