The OP's user name gives us a clue to the worst, Peter Bodak, winger, signed from the rags under (I think) Billy Mac.
Rubbish player whose only effect on City's fortunes was negative, in that he crashed a car on Princess Parkway when driving under the influence, ran away and then got sacked. Unfortunately, Bobby MacDonald, a good player for us, was with him in the car and got sacked too.
Pillock.