The former Leeds and Crystal Palace midfielder has been reflecting on his career.
Indeed, the former Leeds and QPR midfielder left United for Crystal Palace after a breakdown in relationship with Dennis Wise.
In footballing terms, Derry feels he was justified, going on to enjoy Premier League football with both Crystal Palace and QPR.
But the 37-year-old, who has since managed Notts County, says he could have played at Leeds for his whole career.
Derry told the YEP: "I was really torn. I didn’t want to play for Dennis but a big part of me knew Leeds needed help and it went without saying that I wanted to play for the club. Again, it was difficult.
"People will talk about loyalty but it does work both ways. I wasn’t shown any by Dennis and I knew that in different circumstances he wouldn’t have bothered with me. I felt I owed Neil Warnock. I had to be loyal to him.
"It was the right decision to go but a horrible one at the same time Leeds were a club I could have stayed with forever. Those were the quickest three years of my life."
Leeds have suffered their infamous exits over the years, with Rio Ferdinand and Harry Kewell both leaving the Yorkshire club for rivals in high-profile moves.
More recently, Ross McCormack's switch to Fulham raised plenty of eyebrows and caused tension, especially when McCormack was reunited with Leeds fans in the Championship last season.
Derry's is certainly an interesting case for the history books, though. Considering Wise's time at Newcastle, Derry clearly isn't the only man the then Leeds boss has fallen out with. United's loss was Crystal Palace's gain.