Hi JMJ JS,
For the FSSC 22000 certification scheme, you will need to comply with ISO 22000 section 7.1.6 which is essentially standard supplier management requirements, although contract manufacturing typically requires a higher level of scrutiny and management.
7.1.6 Control of externally provided processes, products or services
The organization shall:
a) establish and apply criteria for the evaluation, selection, monitoring of performance and re- evaluation of external providers of processes, products and/or services;
b) ensure adequate communication of requirements to the external provider(s);
c) ensure that externally provided processes, products or services do not adversely affect the organization's ability to consistently meet the requirements of the FSMS;
d) retain documented information of these activities and any necessary actions as a result of the evaluations and re-evaluations.
I would also discuss your plans with your certification body.
Kind regards,
Tony