Nah - Bilic was a world record fee for a defender when we signed him, the value we got out of that was unbelievably poor.
Nyarko - the £4.5m we spent on him was a huge fee for us at the time and again, it proved to be one of the worst buys we ever made.
Niasse - At the time our 3rd highest ever transfer fee on a lad who, let's face it, wasn't even an actual footballer. It was like that George Weah's cousin thing but on a much grander scale. Ended up, like the others above, giving him away on a free.
Sigurdsson, whilst a fraud of a footballer, has been a regular in the team under every manager who he has played under.