diff --git a/.changeset/twenty-taxis-mate.md b/.changeset/twenty-taxis-mate.md
new file mode 100644
index 0000000000..ab3cc6d406
--- /dev/null
+++ b/.changeset/twenty-taxis-mate.md
@@ -0,0 +1,5 @@
+---
+'@backstage/core-compat-api': patch
+---
+
+Plugins converted by `convertLegacyApp` now have their `routes` and `externalRoutes` included as well, allowing the to be used to bind external routes in configuration.
diff --git a/packages/core-compat-api/src/collectLegacyRoutes.tsx b/packages/core-compat-api/src/collectLegacyRoutes.tsx
index 4d560b81d5..7ddb8c4f7e 100644
--- a/packages/core-compat-api/src/collectLegacyRoutes.tsx
+++ b/packages/core-compat-api/src/collectLegacyRoutes.tsx
@@ -32,7 +32,10 @@ import {
 } from '@backstage/frontend-plugin-api';
 import React, { Children, ReactNode, isValidElement } from 'react';
 import { Route, Routes } from 'react-router-dom';
-import { convertLegacyRouteRef } from './convertLegacyRouteRef';
+import {
+  convertLegacyRouteRef,
+  convertLegacyRouteRefs,
+} from './convertLegacyRouteRef';
 import { compatWrapper } from './compatWrapper';
 
 /*
@@ -244,6 +247,8 @@ export function collectLegacyRoutes(
           createApiExtension({ factory }),
         ),
       ],
+      routes: convertLegacyRouteRefs(plugin.routes ?? {}),
+      externalRoutes: convertLegacyRouteRefs(plugin.externalRoutes ?? {}),
     }),
   );
 }