China Zhu Guanio will be one of Ferrari's reserve drivers in 2025.
Sauber, 25, who was dropped by Sauber at the end of last season, joins three years later with the Swiss team, to Antonio Givinazi, Italy.
Zhou, who was a member of the Ferrari Driver Academy from 2015 to 2018, will support the drivers of Lewis Hamilton and Charles Licelk.
Reserve drivers usually do a simulation to help the race team, including weekends on the race as the teams are mastered preparing their cars and performing the specified test duties.
Zhu scored 16 points for a superb in 68 Grands Prix for the team.
Giovinazzi has been part of the Ferrari Driver list since 2017 and ran with Alfa Romeo from 2019-21, scoring 21 points at 62 points.
