Richie Porte will join the BMC Racing Team on a one-year deal after deciding to end his association with Team Sky.
The 30-year-old Australian, who played in his part in helping Sky win three Tour de France titles, will link-up with the US registered team for the 2016 season.
Porte helped Bradley Wiggins win the Tour in 2012 and worked as a domestique for Chris Froome as the British rider claimed victory in 2013 and 2015.
"I want to win again races like Paris-Nice and the Tour of Catalonia," Porte said.
"Next year, why not have a Tejay van Garderen (also of BMC Racing) and myself at the Tour de France, we get on well."
He added: "It's exciting to be in a team where I'll have so many chances to win races."
BMC Racing manager Jim Ochowicz added:"We officially welcome Richie to the BMC Racing Team.
"Richie's addition to our roster for next year adds extra muscle and a wealth of experience.
"It also gives us the chance to separate and/or unite our strategies and goals as we see fit throughout the season."