diff --git a/core/core.services.yml b/core/core.services.yml
index 6655001af19..552d541f4b8 100644
--- a/core/core.services.yml
+++ b/core/core.services.yml
@@ -1019,9 +1019,9 @@ services:
     arguments: ['@router.route_provider', '@path.current', '@url_generator']
     tags:
       # @todo Try to combine those tags together, see https://www.drupal.org/node/2915772.
-      - { name: service_collector, tag: non_lazy_route_enhancer, call: addRouteEnhancer }
+      - { name: service_collector, tag: non_lazy_route_enhancer, call: addDeprecatedRouteEnhancer }
       - { name: service_collector, tag: route_enhancer, call: addRouteEnhancer  }
-      - { name: service_collector, tag: non_lazy_route_filter, call: addRouteFilter }
+      - { name: service_collector, tag: non_lazy_route_filter, call: addDeprecatedRouteFilter }
       - { name: service_collector, tag: route_filter, call: addRouteFilter }
     calls:
       - [setContext, ['@router.request_context']]
diff --git a/core/lib/Drupal/Core/Routing/Router.php b/core/lib/Drupal/Core/Routing/Router.php
index 94eaf5bf7bb..2480ac9ea7b 100644
--- a/core/lib/Drupal/Core/Routing/Router.php
+++ b/core/lib/Drupal/Core/Routing/Router.php
@@ -84,6 +84,22 @@ class Router extends UrlMatcher implements RequestMatcherInterface, RouterInterf
     $this->filters[] = $route_filter;
   }
 
+  /**
+   * Adds a deprecated route filter.
+   *
+   * @param \Drupal\Core\Routing\FilterInterface $route_filter
+   *   The route filter.
+   *
+   * @deprecated in drupal:10.1.0 and is removed from drupal:11.0.0. Use
+   *   route_filter instead.
+   *
+   * @see https://www.drupal.org/node/2894934
+   */
+  public function addDeprecatedRouteFilter(FilterInterface $route_filter) {
+    @trigger_error('non_lazy_route_filter is deprecated in drupal:10.1.0 and is removed from drupal:11.0.0. Use route_filter instead. See https://www.drupal.org/node/2894934', E_USER_DEPRECATED);
+    $this->filters[] = $route_filter;
+  }
+
   /**
    * Adds a route enhancer.
    *
@@ -94,6 +110,22 @@ class Router extends UrlMatcher implements RequestMatcherInterface, RouterInterf
     $this->enhancers[] = $route_enhancer;
   }
 
+  /**
+   * Adds a deprecated route enhancer.
+   *
+   * @param \Drupal\Core\Routing\EnhancerInterface $route_enhancer
+   *   The route enhancer.
+   *
+   * @deprecated in drupal:10.1.0 and is removed from drupal:11.0.0. Use
+   *   route_enhancer instead.
+   *
+   * @see https://www.drupal.org/node/2894934
+   */
+  public function addDeprecatedRouteEnhancer(EnhancerInterface $route_enhancer) {
+    @trigger_error('non_lazy_route_enhancer is deprecated in drupal:10.1.0 and is removed from drupal:11.0.0. Use route_enhancer instead. See https://www.drupal.org/node/2894934', E_USER_DEPRECATED);
+    $this->enhancers[] = $route_enhancer;
+  }
+
   /**
    * {@inheritdoc}
    */
diff --git a/core/tests/Drupal/Tests/Core/Routing/RouterUnsupportedTest.php b/core/tests/Drupal/Tests/Core/Routing/RouterUnsupportedTest.php
index c28ee30aa14..458654e0e4f 100644
--- a/core/tests/Drupal/Tests/Core/Routing/RouterUnsupportedTest.php
+++ b/core/tests/Drupal/Tests/Core/Routing/RouterUnsupportedTest.php
@@ -3,6 +3,8 @@
 namespace Drupal\Tests\Core\Routing;
 
 use Drupal\Core\Path\CurrentPathStack;
+use Drupal\Core\Routing\EnhancerInterface;
+use Drupal\Core\Routing\FilterInterface;
 use Drupal\Core\Routing\RouteProviderInterface;
 use Drupal\Core\Routing\Router;
 use Drupal\Core\Routing\UrlGeneratorInterface;
@@ -33,4 +35,31 @@ class RouterUnsupportedTest extends UnitTestCase {
     $router->generate($route_name);
   }
 
+  /**
+   * @covers ::addDeprecatedRouteFilter
+   * @covers ::addDeprecatedRouteEnhancer
+   */
+  public function testDeprecatedAdd() {
+    // Test needs access to router's protected properties.
+    $filters = new \ReflectionProperty(Router::class, 'filters');
+    $filters->setAccessible(TRUE);
+    $enhancers = new \ReflectionProperty(Router::class, 'enhancers');
+    $enhancers->setAccessible(TRUE);
+
+    $route_provider = $this->prophesize(RouteProviderInterface::class);
+    $current_path_stack = $this->prophesize(CurrentPathStack::class);
+    $url_generator = $this->prophesize(UrlGeneratorInterface::class);
+    $router = new Router($route_provider->reveal(), $current_path_stack->reveal(), $url_generator->reveal());
+
+    $this->expectDeprecation('non_lazy_route_filter is deprecated in drupal:10.1.0 and is removed from drupal:11.0.0. Use route_filter instead. See https://www.drupal.org/node/2894934');
+    $filter = $this->prophesize(FilterInterface::class)->reveal();
+    $router->addDeprecatedRouteFilter($filter);
+    $this->assertSame($filter, $filters->getValue($router)[0]);
+
+    $this->expectDeprecation('non_lazy_route_enhancer is deprecated in drupal:10.1.0 and is removed from drupal:11.0.0. Use route_enhancer instead. See https://www.drupal.org/node/2894934');
+    $enhancer = $this->prophesize(EnhancerInterface::class)->reveal();
+    $router->addDeprecatedRouteEnhancer($enhancer);
+    $this->assertSame($enhancer, $enhancers->getValue($router)[0]);
+  }
+
 }