A New Zealand national captain and second-row forward, Kearney's club football career, which spanned from the early 1990s to the mid-2000s, was played for the Randwick Kingfishers, Western Suburbs Magpies, Auckland Warriors, Melbourne Storm (with whom he won the 1999 NRL Premiership), and Hull F.C. (with whom he won the 2005 Challenge Cup).