FIDIC Red, Yellow, and Silver Books (both editions) contain a provision for the Engineer or...

All main FIDIC contract editions contain provisions that allow the Employer or Engineer to propose or instruct the Contractor to employ certain subcontractors (e.g., nominated subcontractors). The Contractor retains the right to refuse such subcontractors only for reasonable cause, which must be communicated formally.

This mechanism protects the Employer’s interests in subcontractor selection while safeguarding the Contractor’s right to reject subcontractors that may not be competent or suitable.

Therefore, the statement is true.