Marshall spent two seasons with Norwich, making the move from Celtic in a £750,000 transfer during 2007.
Marshall told the Western Mail: "I was ever present over my two seasons. It was a massive change in lifestyle from Glasgow.
"Norwich is a lovely city and I lived in a lovely area just outside. I really enjoyed it there, but looking back relegation was probably inevitable when you look at the number of times they changed manager.
"Being relegated was hard and I didn't fancy League One football. Then Cardiff got in touch and that gave me a lift. Not just a Championship club, but a big, ambitious Championship club."
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