The Republic of Ireland international was under Strachan's guidance at Parkhead between 2005 and 2009 and although he had his differences with the now Scotland manager, he does suggest his game improved dramatically during his time in Glasgow.
"Myself and Strachan had our differences but overall he took my game to the next level," he told the Daily Record.
"I won several Player of the Year awards in 2008 and he did help me a lot.
"He was always on at me. Tracking back was probably his thing for me. The penny finally dropped for me that I had to bring that into my game.
"If you don't track back then you are a luxury player, aren't you? Only so many luxury players get a game every week at top clubs. You have to be unbelievable, really, to be allowed to be a luxury.
"He also wanted me to appreciate the work ethic side of the game and become more tuned in to being a team player.
"So to improve I had to bring that into my game. I worked on it - I was conscious my role had to change."
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