diff --git a/src/Symfony/Bundle/FrameworkBundle/CHANGELOG.md b/src/Symfony/Bundle/FrameworkBundle/CHANGELOG.md
index 7160a372af..40b0281831 100644
--- a/src/Symfony/Bundle/FrameworkBundle/CHANGELOG.md
+++ b/src/Symfony/Bundle/FrameworkBundle/CHANGELOG.md
@@ -1,6 +1,11 @@
 CHANGELOG
 =========
 
+4.1.0
+-----
+
+ * allowed to pass an optional `LoggerInterface $logger` instance to the `Router`
+
 4.0.0
 -----
 
diff --git a/src/Symfony/Bundle/FrameworkBundle/Resources/config/routing.xml b/src/Symfony/Bundle/FrameworkBundle/Resources/config/routing.xml
index f6bd479d8e..81af5c397c 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Resources/config/routing.xml
+++ b/src/Symfony/Bundle/FrameworkBundle/Resources/config/routing.xml
@@ -51,6 +51,7 @@
         </service>
 
         <service id="router.default" class="Symfony\Bundle\FrameworkBundle\Routing\Router">
+            <tag name="monolog.logger" channel="router" />
             <argument type="service" id="service_container" />
             <argument>%router.resource%</argument>
             <argument type="collection">
@@ -66,6 +67,7 @@
                 <argument key="matcher_cache_class">%router.cache_class_prefix%UrlMatcher</argument>
             </argument>
             <argument type="service" id="router.request_context" on-invalid="ignore" />
+            <argument type="service" id="logger" on-invalid="ignore" />
             <call method="setConfigCacheFactory">
                 <argument type="service" id="config_cache_factory" />
             </call>
diff --git a/src/Symfony/Bundle/FrameworkBundle/Routing/Router.php b/src/Symfony/Bundle/FrameworkBundle/Routing/Router.php
index 0148dbf73d..232b39283c 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Routing/Router.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Routing/Router.php
@@ -11,6 +11,7 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Routing;
 
+use Psr\Log\LoggerInterface;
 use Symfony\Component\Config\Loader\LoaderInterface;
 use Symfony\Component\DependencyInjection\Config\ContainerParametersResource;
 use Symfony\Component\DependencyInjection\ServiceSubscriberInterface;
@@ -33,17 +34,19 @@ class Router extends BaseRouter implements WarmableInterface, ServiceSubscriberI
     private $collectedParameters = array();
 
     /**
-     * @param ContainerInterface $container A ContainerInterface instance
-     * @param mixed              $resource  The main resource to load
-     * @param array              $options   An array of options
-     * @param RequestContext     $context   The context
+     * @param ContainerInterface   $container A ContainerInterface instance
+     * @param mixed                $resource  The main resource to load
+     * @param array                $options   An array of options
+     * @param RequestContext       $context   The context
+     * @param LoggerInterface|null $logger
      */
-    public function __construct(ContainerInterface $container, $resource, array $options = array(), RequestContext $context = null)
+    public function __construct(ContainerInterface $container, $resource, array $options = array(), RequestContext $context = null, LoggerInterface $logger = null)
     {
         $this->container = $container;
 
         $this->resource = $resource;
         $this->context = $context ?: new RequestContext();
+        $this->logger = $logger;
         $this->setOptions($options);
     }