Team Sky have named 2014 world road race champion Michal Kwiatkowski as their seventh and final signing for the new season.
The 25-year-old Pole will join the British squad from Etixx - Quick-Step on January 1.
Kwiatkowski is one of the most highly rated young talents in the sport, specialising in hilly one-day classics and week-long stage races.
As well as the claiming the rainbow jersey last year, he has also won the Amstel Gold Race, Strade Bianche and the Volta ao Algarve in his six-year professional career.
Kwiatkowski told teamsky.com: "Team Sky aim for the highest goals in cycling so I'm very happy that this move has become a reality.
"Sir Dave Brailsford believes in my ability, which gives me great confidence for next season, and I know that this team can help me raise my performance levels and win big races.
"The team's marginal gains philosophy really fits my approach to cycling and I have great respect for what this team has achieved in such a short time. I am excited and motivated to race for Team Sky next year."
Team Sky principal Sir Dave Brailsford said: "Michal has performed fantastically well over the past couple of years. We have been following Michal's career for a long time. We tried to sign him four years ago, we tried to sign him two years ago, so this time we weren't going to miss out.
"We would like to think that we could add value to his career and offer him an opportunity to develop with Team Sky in both his one-day racing and stage racing.
"He is a future talent and he can keep getting better. His progression is what we are interested in and being part of that development."
Team Sky have not revealed the length of contract Kwiatkowski has signed.
They previously announced the signatures of Alex Peters, Gianni Moscon, Michal Golas, Danny van Poppel, Benat Intxausti and Mikel Landa.
