Alex Marquez will make the step up to MotoGP for the 2020 season and join brother Marc Marquez at Repsol Honda.
Alex, 23, won the Moto2™ title in 2019 and is now to follow in the footsteps of reigning MotoGP™ champion Marc.
Marc claimed the Moto2™ championship in 2012, before topping the riders' standings in six of his seven seasons in the premier class.
Honda have signed Alex to replace three-time MotoGP™ champion Jorge Lorenzo, who retired at the end of the season.
Alex has signed a one-year contract with the team as he prepares to ride the Honda RC213V in his debut campaign in the top category.