The 33-year-old had one season with the men of Gwent whilst also appearing for premiership sides Bedwas and Cross Keys.
The Italian international made 15 appearances for the Dragons during last season.
Newport Gwent Dragons chief executive Gareth Davies commented: "Kris is very professional both on and off the field. He handled himself well during the season he was with us.
"We wish Kris and his family the very best with their move back to Australia."
Guinness PRO12
Suite 208, Alexandra House,
The Sweepstakes
Ballsbridge, Dublin 4, Ireland
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