Welcome to The Cove, Kelley. Without more context is really hard to provide meaningful feedback. Under the risk based thinking framework one should implement ISO 9001, the last paragraph of section 8.4.1 requires your organization to establish and enforce criteria for the selection of suppliers. Depending on the nature of the raw material, a simple selection process could be ok. In other cases, if risk of supply disruption can create huge problems for your organization, RBT 101 would suggest you might benefit from a multi-disciplinary, intensive supplier selection and approval process, with layers of reviews, including higher ups.
There is no one-size fits all. Context and risks have to be assessed to determine the adequacy of any supplier approval process,