Dean completes his four-year contract with Garmin-Cervelo at the end of the year.
The two-time New Zealand champion has gained a reputation as one of the sport's premier sprinters, with 2010 world champion Thor Hushovd labelling Dean the best lead-out rider in the world.
GreenEDGE will be Dean's fifth major cycling team after US Postal (1999-2001), CSC-Tiscali (2002-2003), Credit Agricole (2004-2007) and Garmin-Chipotle (later Garmin-Cervelo) in 2008-2011.
He has completed seven Tours de France and was part of this year's Garmin-Cervelo team that won the team time trial and finished as leading team at Le Tour.
He enjoyed three podium finishes in the 2010 Tour de France as well as two podiums at the Giro d'Italia. In the 2008 Tour de France he took a top-10 placing in six stages and in 2009 he was the only professional to complete all three grand tours _ the Giro d'Italia, Tour de France and Vuelta a Espana.
Dean believes he is riding as well as at any time in his long career.
"I think I have something still to offer and believe over the last two to three years especially, I have raced at my best,'' he said.
"There are plenty of incentives next year with this new team wanting to make a mark and I would also love to compete in my fifth Olympics - that would be special.''
Dean would not be drawn on whether he would retire at the end of next year.
"At this stage I am just looking one year at a time, and there are no specific plans to race in 2013. But you never say 'never'.''