Thurstans announced his retirement from Port Adelaide on Thursday 3 September 2009, after playing 110 games for the club since his debut in 2003. Thurstans retired as a Life Member of the Port Adelaide Football Club, citing his decision to retire had been coming for a while, despite some good form throughout the 2009 season: "The mental and physical rigours of an AFL season demand so much, and I am not the sort of person who is going to go on unless I think I can contribute 100 percent."