Wittich served as F1’s race director, whilst Basarri left his position as the FIA’s compliance officer.
Both of their exits follow key staff departures from 2023, including former sporting director Steve Nielsen who quit after less than a year in his role, and Deborah Mayer, who was head of the FIA commission for women.
The role of Digital Director for the FIA will be undertaken by Lee Fedden, whose previous experience includes leading Williams’ data and analytics team.
In his role as digital director, Fedden will deliver the execution of a digital strategy which ensures all information systems are 'secure, scalable, and aligned with the FIA's strategic goals'.
"We are delighted that someone of Lee’s renowned expertise is joining the organisation to oversee the transformation of our IT operations," FIA president Mohammed Ben Sulayem said.
"Lee brings a wealth of experience to the role of streamlining our digital and information systems and driving engagement with our stakeholders, particularly our Member Clubs."