diff --git a/core/lib/Drupal/Core/Routing/RouteProvider.php b/core/lib/Drupal/Core/Routing/RouteProvider.php
index e621f236a5..c3303968c2 100644
--- a/core/lib/Drupal/Core/Routing/RouteProvider.php
+++ b/core/lib/Drupal/Core/Routing/RouteProvider.php
@@ -460,9 +460,12 @@ public function getRoutesPaged($offset, $length = NULL) {
   }
 
   /**
-   * {@inheritdoc}
+   * Gets the total count of routes provided by the router.
+   *
+   * @deprecated in drupal:9.1.0 and is removed from drupal:10.0.0
    */
   public function getRoutesCount() {
+    @trigger_error(__CLASS__ . '::getRoutesCount() is deprecated in drupal:9.1.0 and is removed from drupal:10.0.0', E_USER_DEPRECATED);
     return $this->connection->query("SELECT COUNT(*) FROM {" . $this->connection->escapeTable($this->tableName) . "}")->fetchField();
   }
 
diff --git a/core/lib/Drupal/Core/Routing/RouteProviderLazyBuilder.php b/core/lib/Drupal/Core/Routing/RouteProviderLazyBuilder.php
index d31338cbac..2c631f8278 100644
--- a/core/lib/Drupal/Core/Routing/RouteProviderLazyBuilder.php
+++ b/core/lib/Drupal/Core/Routing/RouteProviderLazyBuilder.php
@@ -133,14 +133,17 @@ public function reset() {
    * @deprecated in drupal:9.1.0 and is removed from drupal:10.0.0.
    */
   public function getRoutesPaged($offset, $length = NULL) {
-    @trigger_error(__CLASS__ . '::getRoutesPaged is deprecated in drupal:9.1.0 and is removed from drupal:10.0.0', E_USER_DEPRECATED);
+    @trigger_error(__CLASS__ . '::getRoutesPaged() is deprecated in drupal:9.1.0 and is removed from drupal:10.0.0', E_USER_DEPRECATED);
     return $this->getRouteProvider()->getRoutesPaged($offset, $length);
   }
 
   /**
-   * {@inheritdoc}
+   * Gets the total count of routes provided by the router.
+   *
+   * @deprecated in drupal:9.1.0 and is removed from drupal:10.0.0
    */
   public function getRoutesCount() {
+    @trigger_error(__CLASS__ . '::getRoutesCount() is deprecated in drupal:9.1.0 and is removed from drupal:10.0.0', E_USER_DEPRECATED);
     return $this->getRouteProvider()->getRoutesCount();
   }
 
diff --git a/core/tests/Drupal/KernelTests/RouteProvider.php b/core/tests/Drupal/KernelTests/RouteProvider.php
index 872e4ed981..f075dbae0d 100644
--- a/core/tests/Drupal/KernelTests/RouteProvider.php
+++ b/core/tests/Drupal/KernelTests/RouteProvider.php
@@ -91,11 +91,4 @@ public function reset() {
     return $this->lazyLoadItself()->reset();
   }
 
-  /**
-   * {@inheritdoc}
-   */
-  public function getRoutesCount() {
-    return $this->lazyLoadItself()->getRoutesCount();
-  }
-
 }