After playing with the Glory in the 2003/2004 season of the National Soccer League, the NSL was disbanded, and Harnwell had the option to continue his career overseas in England.
Harnwell played for Western Australian State League club Sorrento FC with his younger brother Todd while he waited for the A-League to begin.
Both players were reprimanded by Perth Glory, fined half a week's wages and given a suspended one match ban.
[4] Against Adelaide in November 2007, Harnwell played his 200th game for the Glory, the third player to do so after Bobby Despotovski and Scott Miller.
[5] On 14 February 2008, Harnwell moved to Liechtenstein's only professional club, FC Vaduz, and signed a loan contract until the end of season.