PF: Is it necessary to translate supporting documents (CV, PhD diploma, etc.) into English for a MSCA Postdoctoral Fellowships application?

The researcher’s CV, as an integral part of the proposal, should be written in the same language as the whole proposal.

A PhD diploma may be required by the host institution to check and confirm the applicant’s eligibility. It is up to the institution to decide if the diploma should be translated into a specific language.