Few candidates for me
Chris Taylor - absolute carthouse and how he's still playing is a mystery. I saw him in a pre-season game against Stockport County a couple of years ago and he looked shite even against them.
Keith Andrews - i thought he would be a great signing, how wrong i was! Never looked interested and moaned through his entire time at Bolton and still moans about us now the bastard!
Steve Elliott - going back a bit here but he was truly shocking, he made Thomas and Morgan look like world beaters.
I could go on and on as Big Sam used to unearth some right donkeys on loan but i'll leave that to others to point out how shit they were