Hamilton described his debut Ferrari season as a "nightmare" following a "disastrous" weekend at Interlagos, where he retired due to car damage and a penalty.
Leclerc also suffered a mechanical retirement in Brazil, contributing to Ferrari dropping to fourth in the constructors’ championship and remaining winless in 2025.
Elkann acknowledged the strong performance of Ferrari's mechanics and engineers but stated that other aspects, including the drivers, were "not up to par".
Despite the setbacks, Hamilton expressed hope for future improvements, particularly with new regulations coming into force next year.