"Whilst I believe that I could have played on at the NRL level, the timing is right for me to step back from the NRL.
"The Dragons have recruited really well for next season, they are in good shape and I am really pleased to be able to stay involved in the game I love and the area through the Thirroul Butchers.''
A hooker for the majority of his career Fien was thrust into the halves by coach Steve Price and the Mt Isa junior has consistently struggled to spark the Dragons attack.
The club has brought Melbourne's Gareth Widdop and Canberra's Sam Williams for the 2014 season, a move that would have forced Fien's hand.
A bench player for St George Illawarra in their 2010 grand final win, Fien will perhaps be best remembered for the 2006 `Grannygate' saga.
Despite playing one game for Queensland in 2001 Fien played for the Kiwis during the 2006 Tri Nations despite being ineligible to do so.
He claimed eligibility based on the grandparent rule before it was later revealed it was based upon his great-grandmother.
Fien, legitimately qualified to play for New Zealand in 2007 through residency rules but not before the Kiwis were stripped of Tri Nations points and NZRL chairman Selwyn Bennett resigned over the incident.
Fien played 20 Tests for the Kiwis.
-AAP