Spells at Nottingham Forest, on loan, and Leeds followed before returning to Selhurst Park as one of Warnock's first signings as Crystal Palace boss.
Derry said he was looking forward to being re-united with his former manager: "Neil was a big sway. When he comes calling, you have to consider what he brings to the table and I really like working with him.
"He knows what he wants and he's got a way of getting the best out of people. Whenever I've played under him, I've played my best football and long may that continue."
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