Has an appointment letter been issued to this employee? Or are you planning to re-issue one for him? If you wish to include information about the NDA/NCA in the appointment letter, the following clause can be added:
Non-Disclosure/Non-Compete Clause
You will not disclose, by word of mouth or otherwise, any particulars or details of business plans, trade secrets, financial information, know-how, or any other confidential information of the business that comes to your knowledge through your employment at XXXXXXXX India Pvt. Ltd. Details regarding non-compete conditions will be explained and specified in the Non-Disclosure & Non-Compete agreements, which will be provided to you for signature on the date of joining.