diff --git a/lib/Doctrine/DBAL/Sharding/PoolingShardManager.php b/lib/Doctrine/DBAL/Sharding/PoolingShardManager.php
index 81a197ee117..739cfaba6e1 100644
--- a/lib/Doctrine/DBAL/Sharding/PoolingShardManager.php
+++ b/lib/Doctrine/DBAL/Sharding/PoolingShardManager.php
@@ -3,6 +3,7 @@
 namespace Doctrine\DBAL\Sharding;
 
 use Doctrine\DBAL\Sharding\ShardChoser\ShardChoser;
+use Doctrine\Deprecations\Deprecation;
 use RuntimeException;
 
 /**
@@ -23,6 +24,12 @@ class PoolingShardManager implements ShardManager
 
     public function __construct(PoolingShardConnection $conn)
     {
+        Deprecation::trigger(
+            'doctrine/dbal',
+            'https://github.com/doctrine/dbal/issues/3595',
+            'Native Sharding support in DBAL is removed without replacement.'
+        );
+
         $params       = $conn->getParams();
         $this->conn   = $conn;
         $this->choser = $params['shardChoser'];
diff --git a/lib/Doctrine/DBAL/Sharding/SQLAzure/SQLAzureShardManager.php b/lib/Doctrine/DBAL/Sharding/SQLAzure/SQLAzureShardManager.php
index d511553c155..83ad879f293 100644
--- a/lib/Doctrine/DBAL/Sharding/SQLAzure/SQLAzureShardManager.php
+++ b/lib/Doctrine/DBAL/Sharding/SQLAzure/SQLAzureShardManager.php
@@ -6,6 +6,7 @@
 use Doctrine\DBAL\Sharding\ShardingException;
 use Doctrine\DBAL\Sharding\ShardManager;
 use Doctrine\DBAL\Types\Type;
+use Doctrine\Deprecations\Deprecation;
 use RuntimeException;
 
 use function sprintf;
@@ -40,6 +41,12 @@ class SQLAzureShardManager implements ShardManager
      */
     public function __construct(Connection $conn)
     {
+        Deprecation::trigger(
+            'doctrine/dbal',
+            'https://github.com/doctrine/dbal/issues/3595',
+            'Native Sharding support in DBAL is removed without replacement.'
+        );
+
         $this->conn = $conn;
         $params     = $conn->getParams();