By FOX Sports staff
Heart, who finished second from bottom last term, announced the deal on Tuesday morning and Kisnorbo's arrival comes as a huge boost given the club are still coming to terms with a serious injury to marquee signing and ex-Netherlands international Orlando Engelaar.
The 32-year-old, who began his career with South Melbourne, has spent the last decade in the United Kingdom with Scottish side Hearts and English outfits Leeds and Leicester, but most recently spent time on loan at Ipswich towards the end of last season.
Having been released by Leicester in May, Kisnorbo was available on a free transfer and Heart coach John Aloisi was pleased to seal the services of his former Australia team-mate.
"In addition to being an excellent defender, Patrick brings tremendous leadership qualities and competitiveness to our defensive half," he said on the club's official website.
"Anyone who has followed the Socceroos appreciates the energy and fearlessness with which Patrick plays and his all-round game means he can partner with anyone in central defence.
"Having him in the squad strengthens our spine and provides me with a number of tactical options."
The club also confirmed that Kisnorbo had passed a medical after arriving in Melbourne last Sunday, and will travel with his new team-mates for their two-match pre-season tour of Western Australia.