During his career at Auckland City FC they won the Oceania Champions League 2010/11, qualifying for the FIFA World Club Cup in Japan 2011.
In the 2005/06 season Canterbury reached the New Zealand Football Championship grand final,[2] with Kelly scoring two goals in the 90 minutes against Auckland City FC.
The game was broadcast on Sky Sports in Australia and brought interest from A-League club Newcastle Jets and Oakleigh Cannons.
[3] In 2008 Kelly signed for Australian Club Oakleigh Cannons,[4] playing under former Glasgow Rangers and Scotland player Stuart Munro.
His time at South Melbourne FC[5] was cut short when he suffered a broken leg[6] during a freak training ground collision.
In September 2008 Kelly returned to the New Zealand Football Championship signing 1-year with Otago United[7] with former international Terry Phelan as his coach.
Auckland City FC won the Oceania Champions League 2011[9] and were closely beaten in the 2010/11 New Zealand Football Championship grand final[10] going down 3–2 to Waitakere United to an injury time winning goal.
Kelly made his début against BEC Tero just five days after winning the 2010–11 OFC Champions League with Auckland City FC.
In January 2013, Kelly signed for Nakhon Pathom United but left when the head coach was sacked prior to the start of the season.
In 2022 Kelly accepted the role as technical director of Australian National Premier League club Eastern Suburbs FC based in Brisbane.