(45)Issuers of European Green Bonds may need to engage the services of third-country external reviewers from outside the Union. It is therefore necessary to lay down a third-country regime for external reviewers on the basis of an equivalence assessment, recognition or endorsement under which third-country external reviewers may provide external review services. In order to facilitate access for third-country external reviewers in the absence of an equivalence decision, it is necessary to lay down a process for the recognition by ESMA of external reviewers established in a third country.