sentences:  In 2005 and 2006, Thurstans struggled to find the form he had in 2004 and was used as trade bait at the end of the 2006 season but remained with Port Adelaide.Thurstans played all 25 games for Port in 2007, starring in his new role as a defender, getting back to the form he displayed in 2004.Thurstans announced his retirement from Port Adelaide on Thursday 3 September 2009, after playing 110 games for the club since his debut in 2003.