Young driver Charles Leclerc will race for Sauber in the 2018 Formula One season, it was announced on Saturday.
Leclerc, 20, will line up alongside Swedish driver Marcus Ericsson.
The Monegasque replaces Pascal Wehrlein, with Antonio Giovanazzi missing out on a seat - instead settling for the third driver role.
The announcement came as Sauber revealed a concept Alfa Romeo livery following their partnership with the Italian car manufacturer.
The deal will see Sauber forge a closer relationship with the Scuderia Ferrari team.
Sergio Marchionne, the chairman of both Ferrari and FIAT-owned Alfa, officially launched the car brand's return after a 30-year absence.
Leclerc joins Sauber after having tested for Ferrari the last two years.
He is one of the most highly-rated young drivers in motorsport, having won the 2017 FIA Formula 2 Championship, and was also the GP3 Series champion in 2016.