diff --git a/lib/modules/manager/gitlabci/common.ts b/lib/modules/manager/gitlabci/common.ts
index 38452d1b50..9daf9f207b 100644
--- a/lib/modules/manager/gitlabci/common.ts
+++ b/lib/modules/manager/gitlabci/common.ts
@@ -37,5 +37,5 @@ export function isGitlabIncludeLocal(
 export function isGitlabIncludeComponent(
   include: GitlabInclude,
 ): include is GitlabIncludeComponent {
-  return !is.undefined((include as GitlabIncludeComponent).component);
+  return is.string((include as GitlabIncludeComponent).component);
 }
diff --git a/lib/modules/manager/gitlabci/extract.spec.ts b/lib/modules/manager/gitlabci/extract.spec.ts
index 84ab81e28c..750273089e 100644
--- a/lib/modules/manager/gitlabci/extract.spec.ts
+++ b/lib/modules/manager/gitlabci/extract.spec.ts
@@ -231,6 +231,7 @@ describe('modules/manager/gitlabci/extract', () => {
     it('extract images via registry aliases', () => {
       const registryAliases = {
         $CI_REGISTRY: 'registry.com',
+        $BUILD_IMAGES: 'registry.com/build-images',
         foo: 'foo.registry.com',
       };
       const res = extractPackageFile(
@@ -242,6 +243,7 @@ describe('modules/manager/gitlabci/extract', () => {
           - foo/mariadb:10.4.11
           - name: $CI_REGISTRY/other/image1:1.0.0
             alias: imagealias1
+          - $BUILD_IMAGES/image2:1.0.0
       `,
         '',
         {
@@ -279,6 +281,16 @@ describe('modules/manager/gitlabci/extract', () => {
           depType: 'service-image',
           replaceString: '$CI_REGISTRY/other/image1:1.0.0',
         },
+        {
+          autoReplaceStringTemplate:
+            '$BUILD_IMAGES/image2:{{#if newValue}}{{newValue}}{{/if}}{{#if newDigest}}@{{newDigest}}{{/if}}',
+          currentDigest: undefined,
+          currentValue: '1.0.0',
+          datasource: 'docker',
+          depName: 'registry.com/build-images/image2',
+          depType: 'service-image',
+          replaceString: '$BUILD_IMAGES/image2:1.0.0',
+        },
       ]);
     });
 
@@ -357,6 +369,7 @@ describe('modules/manager/gitlabci/extract', () => {
     it('extracts component references via registry aliases', () => {
       const registryAliases = {
         $CI_SERVER_HOST: 'gitlab.example.com',
+        $COMPONENT_REGISTRY: 'gitlab.example.com/a-group',
       };
       const content = codeBlock`
         include:
@@ -373,6 +386,7 @@ describe('modules/manager/gitlabci/extract', () => {
               malformed: true
           - component: $CI_SERVER_HOST/an-org/a-component@1.0
           - component: other-gitlab.example.com/an-org/a-project/a-component@1.0
+          - component: $COMPONENT_REGISTRY/a-project/a-component@1.0
       `;
       const res = extractPackageFile(content, '', {
         registryAliases,
@@ -414,6 +428,13 @@ describe('modules/manager/gitlabci/extract', () => {
           depType: 'repository',
           registryUrls: ['https://other-gitlab.example.com'],
         },
+        {
+          currentValue: '1.0',
+          datasource: 'gitlab-tags',
+          depName: 'a-group/a-project',
+          depType: 'repository',
+          registryUrls: ['https://gitlab.example.com'],
+        },
       ]);
     });
 
diff --git a/lib/modules/manager/gitlabci/extract.ts b/lib/modules/manager/gitlabci/extract.ts
index d00ca9c868..09e4ba195e 100644
--- a/lib/modules/manager/gitlabci/extract.ts
+++ b/lib/modules/manager/gitlabci/extract.ts
@@ -122,12 +122,16 @@ function extractDepFromIncludeComponent(
   includeComponent: GitlabIncludeComponent,
   registryAliases?: Record<string, string>,
 ): PackageDependency | null {
-  const componentReference = componentReferenceRegex.exec(
-    includeComponent.component,
-  )?.groups;
+  let componentUrl = includeComponent.component;
+  if (registryAliases) {
+    for (const key in registryAliases) {
+      componentUrl = componentUrl.replace(key, registryAliases[key]);
+    }
+  }
+  const componentReference = componentReferenceRegex.exec(componentUrl)?.groups;
   if (!componentReference) {
     logger.debug(
-      { componentReference: includeComponent.component },
+      { componentReference: componentUrl },
       'Ignoring malformed component reference',
     );
     return null;
@@ -135,15 +139,11 @@ function extractDepFromIncludeComponent(
   const projectPathParts = componentReference.projectPath.split('/');
   if (projectPathParts.length < 2) {
     logger.debug(
-      { componentReference: includeComponent.component },
+      { componentReference: componentUrl },
       'Ignoring component reference with incomplete project path',
     );
     return null;
   }
-  const aliasValue = registryAliases?.[componentReference.fqdn];
-  if (aliasValue) {
-    componentReference.fqdn = aliasValue;
-  }
 
   const dep: PackageDependency = {
     datasource: GitlabTagsDatasource.id,