While Sauber is not a competitive team and Leclerc will likely struggle to score points by finishing races in the top 10, this will be a great opportunity for him to showcase his driving talent to some of the sport's top teams.
The long-awaited announcement was made by Fiat Chrysler chief executive Sergio Marchionne at a presentation of Alfa Romeo's new partnership with the Swiss team on Saturday.
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This season, however, Citizens earned all three points thanks to a late victor from Raheem Sterling. Guardiola said he would "never judge the way opponents play against one of my teams".
The covers were then pulled off a showcar, revealing a red and white livery, with a large Alfa Romeo logo on the engine cover.
Wehrlein, who won five points in 2017, is left without a seat, with Williams the only team left with an opening following Felipe Massa's retirement.
Antonio Giovinazzi is the reserve driver.
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"This agreement with the Sauber F1 team is a significant step in the reshaping of the Alfa Romeo brand", Marchionne said earlier this week. That was promptly followed by a deal with Ferrari for 2018. He is clearly deserving of a shot in Formula One.
Sauber finished last in the constructors' championship for the first time in their history in 2017.
Ferrari's late founder Enzo also started out racing and managing a team for Alfa Romeo, before setting up on his own in the late 1930s.
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