Opoku, who had served in the Research, Monitoring and Evaluation unit of Cocobod, replaces Nana Oduro Owusu, whose contract has been terminated, two sources told Reuters.

It is not clear what may have led to Oduro's removal. "The new appointments took effect from October 1 in a letter issued from the President's office," one source said.

Emmanuel Agyemang Dwomoh, head of the Cocoa Research Institute is now deputy chief executive for Agronomy and Quality Control, replacing Yaw Adu-Ampomah, who has been reassigned as advisor to the Minister of Agriculture.

The President also appointed Emmanuel Ray Ankrah as deputy chief executive for Finance and Administration to succeed William Mensah, who has retired, the sources said.

(Reporting by Kwasi Kpodo, editing by Louise Heavens)