diff --git a/src/collections/sanitize.js b/src/collections/sanitize.js
index f1dc7b1024..0a8d066e54 100644
--- a/src/collections/sanitize.js
+++ b/src/collections/sanitize.js
@@ -257,7 +257,8 @@ const sanitizeCollection = (collections, collection) => {
   // Sanitize fields
   // /////////////////////////////////
 
-  sanitized.fields = sanitizeFields(collections, sanitized.fields);
+  const validRelationships = collections.map((c) => c.slug);
+  sanitized.fields = sanitizeFields(validRelationships, sanitized.fields);
 
   return sanitized;
 };
diff --git a/src/fields/sanitize.js b/src/fields/sanitize.js
index 6bab55fded..11df858afe 100644
--- a/src/fields/sanitize.js
+++ b/src/fields/sanitize.js
@@ -1,11 +1,9 @@
 const { MissingFieldType, InvalidFieldRelationship } = require('../errors');
 const validations = require('./validations');
 
-const sanitizeFields = (collections, fields) => {
+const sanitizeFields = (validRelationships, fields) => {
   if (!fields) return [];
 
-  const validSlugs = collections.map((c) => c.slug);
-
   return fields.map((unsanitizedField) => {
     const field = { ...unsanitizedField };
 
@@ -13,14 +11,14 @@ const sanitizeFields = (collections, fields) => {
 
     if (field.type === 'blocks') {
       field.blocks.forEach((blockCollection) => {
-        sanitizeFields(collections, blockCollection.fields);
+        sanitizeFields(validRelationships, blockCollection.fields);
       });
     }
 
     if (field.type === 'relationship') {
       const relationships = Array.isArray(field.relationTo) ? field.relationTo : [field.relationTo];
       relationships.forEach((relationship) => {
-        if (!validSlugs.includes(relationship)) {
+        if (!validRelationships.includes(relationship)) {
           throw new InvalidFieldRelationship(field, relationship);
         }
       });
diff --git a/src/globals/sanitize.js b/src/globals/sanitize.js
index 3792610b88..1d50e42f3c 100644
--- a/src/globals/sanitize.js
+++ b/src/globals/sanitize.js
@@ -1,7 +1,7 @@
 const { MissingGlobalLabel } = require('../errors');
 const sanitizeFields = require('../fields/sanitize');
 
-const sanitizeGlobals = (globals) => {
+const sanitizeGlobals = (collections, globals) => {
   // /////////////////////////////////
   // Ensure globals are valid
   // /////////////////////////////////
@@ -33,7 +33,8 @@ const sanitizeGlobals = (globals) => {
     // Sanitize fields
     // /////////////////////////////////
 
-    sanitizedGlobal.fields = sanitizeFields(global.fields);
+    const validRelationships = collections.map((c) => c.slug);
+    sanitizedGlobal.fields = sanitizeFields(validRelationships, global.fields);
 
     return sanitizedGlobal;
   });
diff --git a/src/utilities/sanitizeConfig.js b/src/utilities/sanitizeConfig.js
index ee2228e6c0..d34574a82f 100644
--- a/src/utilities/sanitizeConfig.js
+++ b/src/utilities/sanitizeConfig.js
@@ -10,7 +10,7 @@ const sanitizeConfig = (config) => {
   sanitizedConfig.collections = sanitizedConfig.collections.map((collection) => sanitizeCollection(sanitizedConfig.collections, collection));
 
   if (sanitizedConfig.globals) {
-    sanitizedConfig.globals = sanitizeGlobals(sanitizedConfig.globals);
+    sanitizedConfig.globals = sanitizeGlobals(sanitizedConfig.collections, sanitizedConfig.globals);
   } else {
     sanitizedConfig.globals = [];
   }