Frenchman Jean-Eric Vergne has replaced Spaniard Pedro De la Rosa as Ferrari test driver, the Formula One team said.
Vergne, who raced for Toro Rosso this year, will focus mainly on car development work in the simulator.
Mexican Esteban Gutiérrez has already been appointed as test and reserve driver, while Spaniard Marc Gene and Italian Davide Rigon will also carry out some testing duties.
“I feel honoured to be joining the Ferrari family and becoming a part of the most prestigious team in the history of F1,” Vergne said in a statement.
“The objective is to help the Scuderia get back to the top step of the podium.”
Ferrari are going through a major overhaul after experiencing their first season without a race win since 1993.
Fernando Alonso has also left, his place taken by Sebastian Vettel.