Team Sky have announced the signings of Spanish duo Jonathan Castroviejo and David de la Cruz.
The 30-year-old Castroviejo has signed a three-year deal after spending the last six seasons with Movistar and is regarded as a top class all-round rider, and an excellent time trialist.
He helped Nairo Quintana to victory in the 2014 Giro d'Italia and 2016 Vuelta a Espana and is the current and three-time Spanish national time trial champion.
De la Cruz, who is currently with QuickStep Floors, is also a versatile performer and he was seventh overall at the Vuelta last year, having won a stage and worn the leader's jersey.
Castroviejo told the Team Sky website: "Everybody knows the strength in the team, and how important the spirit between the riders is to the team's success.
"I'm really looking forward to being part of that, bringing my own experience and learning new things.
"I have been part of Grand Tour winning teams in the past and I want to do that again in the future. I'm happy to be taking this next step with Team Sky."
And De la Cruz said: "I'm excited to be joining the team.
"I've really enjoyed my time at QuickStep but I definitely feel that, at this point in my career, Team Sky is the best place for me to progress and to be the best rider I can be.
"I think the team understand my skills as a rider and what I can offer to the team, so I'm really happy to be joining Team Sky and I am looking forward to this new challenge."
Team Principal Dave Brailsford said: "Jonathan and David are both in the prime of their careers.
"They have impressive results to their name already, individually and as part of winning teams. What we really value is their hunger to continue to develop, and to do that at Team Sky.
"We have a principle that riders should approach a race looking to win, supporting someone else winning, or learning how to win for the future. Jonathan and David know how to win across a range of different scenarios.
"They will fit straight into the team and, importantly, bring their winning experience to a squad full of young talent.
"These are the first of a number of new rider signings we will be making for 2018 as we strengthen our line-up with experienced riders with proven track records, while also seeking to bring in the best young talent from around the world to develop at Team Sky and play a big part in our future."