diff --git a/core/includes/install.core.inc b/core/includes/install.core.inc
index aed688d8be7..6c8a0a7e4ec 100644
--- a/core/includes/install.core.inc
+++ b/core/includes/install.core.inc
@@ -2338,13 +2338,12 @@ function install_config_import_batch() {
   \Drupal::configFactory()->getEditable('system.site')->set('uuid', $system_site['uuid'])->save();
 
   // Create the storage comparer and the config importer.
-  $config_manager = \Drupal::service('config.manager');
-  $storage_comparer = new StorageComparer($sync, \Drupal::service('config.storage'), $config_manager);
+  $storage_comparer = new StorageComparer($sync, \Drupal::service('config.storage'));
   $storage_comparer->createChangelist();
   $config_importer = new ConfigImporter(
     $storage_comparer,
     \Drupal::service('event_dispatcher'),
-    $config_manager,
+    \Drupal::service('config.manager'),
     \Drupal::service('lock.persistent'),
     \Drupal::service('config.typed'),
     \Drupal::service('module_handler'),
@@ -2409,14 +2408,13 @@ function install_config_download_translations(&$install_state) {
 function install_config_revert_install_changes() {
   global $install_state;
 
-  $config_manager = \Drupal::service('config.manager');
-  $storage_comparer = new StorageComparer(\Drupal::service('config.storage.sync'), \Drupal::service('config.storage'), $config_manager);
+  $storage_comparer = new StorageComparer(\Drupal::service('config.storage.sync'), \Drupal::service('config.storage'));
   $storage_comparer->createChangelist();
   if ($storage_comparer->hasChanges()) {
     $config_importer = new ConfigImporter(
       $storage_comparer,
       \Drupal::service('event_dispatcher'),
-      $config_manager,
+      \Drupal::service('config.manager'),
       \Drupal::service('lock.persistent'),
       \Drupal::service('config.typed'),
       \Drupal::service('module_handler'),
diff --git a/core/lib/Drupal/Core/Config/StorageComparer.php b/core/lib/Drupal/Core/Config/StorageComparer.php
index 30958cee1ed..e362493ac30 100644
--- a/core/lib/Drupal/Core/Config/StorageComparer.php
+++ b/core/lib/Drupal/Core/Config/StorageComparer.php
@@ -40,13 +40,6 @@ class StorageComparer implements StorageComparerInterface {
    */
   protected $targetStorages;
 
-  /**
-   * The configuration manager.
-   *
-   * @var \Drupal\Core\Config\ConfigManagerInterface
-   */
-  protected $configManager;
-
   /**
    * List of changes to between the source storage and the target storage.
    *
@@ -96,9 +89,9 @@ class StorageComparer implements StorageComparerInterface {
    * @param \Drupal\Core\Config\StorageInterface $target_storage
    *   Storage object used to write configuration.
    * @param \Drupal\Core\Config\ConfigManagerInterface $config_manager
-   *   The configuration manager.
+   *   (deprecated) The configuration manager. The $config_manager parameter is deprecated since version 8.7.0 and will be removed in 9.0.0.
    */
-  public function __construct(StorageInterface $source_storage, StorageInterface $target_storage, ConfigManagerInterface $config_manager) {
+  public function __construct(StorageInterface $source_storage, StorageInterface $target_storage, ConfigManagerInterface $config_manager = NULL) {
     // Wrap the storages in a static cache so that multiple reads of the same
     // raw configuration object are not costly.
     $this->sourceCacheStorage = new MemoryBackend();
@@ -111,8 +104,11 @@ class StorageComparer implements StorageComparerInterface {
       $target_storage,
       $this->targetCacheStorage
     );
-    $this->configManager = $config_manager;
     $this->changelist[StorageInterface::DEFAULT_COLLECTION] = $this->getEmptyChangelist();
+
+    if ($config_manager !== NULL) {
+      @trigger_error('The storage comparer does not need a config manager. The parameter is deprecated since version 8.7.0 and will be removed in 9.0.0. Omit the third parameter. See https://www.drupal.org/node/2993271.', E_USER_DEPRECATED);
+    }
   }
 
   /**
diff --git a/core/modules/config/src/Form/ConfigSingleImportForm.php b/core/modules/config/src/Form/ConfigSingleImportForm.php
index 83e776c0b0c..91b6d3812bd 100644
--- a/core/modules/config/src/Form/ConfigSingleImportForm.php
+++ b/core/modules/config/src/Form/ConfigSingleImportForm.php
@@ -339,11 +339,7 @@ class ConfigSingleImportForm extends ConfirmFormBase {
     if (!$form_state->getErrors()) {
       $source_storage = new StorageReplaceDataWrapper($this->configStorage);
       $source_storage->replaceData($config_name, $data);
-      $storage_comparer = new StorageComparer(
-        $source_storage,
-        $this->configStorage,
-        $this->configManager
-      );
+      $storage_comparer = new StorageComparer($source_storage, $this->configStorage);
 
       if (!$storage_comparer->createChangelist()->hasChanges()) {
         $form_state->setErrorByName('import', $this->t('There are no changes to import.'));
diff --git a/core/modules/config/src/Form/ConfigSync.php b/core/modules/config/src/Form/ConfigSync.php
index 57fb1d860e0..8cbab3b973c 100644
--- a/core/modules/config/src/Form/ConfigSync.php
+++ b/core/modules/config/src/Form/ConfigSync.php
@@ -180,7 +180,7 @@ class ConfigSync extends FormBase {
       '#value' => $this->t('Import all'),
     ];
     $source_list = $this->syncStorage->listAll();
-    $storage_comparer = new StorageComparer($this->syncStorage, $this->activeStorage, $this->configManager);
+    $storage_comparer = new StorageComparer($this->syncStorage, $this->activeStorage);
     if (empty($source_list) || !$storage_comparer->createChangelist()->hasChanges()) {
       $form['no_changes'] = [
         '#type' => 'table',
@@ -199,7 +199,7 @@ class ConfigSync extends FormBase {
     // A list of changes will be displayed, so check if the user should be
     // warned of potential losses to configuration.
     if ($this->snapshotStorage->exists('core.extension')) {
-      $snapshot_comparer = new StorageComparer($this->activeStorage, $this->snapshotStorage, $this->configManager);
+      $snapshot_comparer = new StorageComparer($this->activeStorage, $this->snapshotStorage);
       if (!$form_state->getUserInput() && $snapshot_comparer->createChangelist()->hasChanges()) {
         $change_list = [];
         foreach ($snapshot_comparer->getAllCollectionNames() as $collection) {
diff --git a/core/modules/config/tests/src/Functional/ConfigImportAllTest.php b/core/modules/config/tests/src/Functional/ConfigImportAllTest.php
index 7d37bc49099..01210c37e2b 100644
--- a/core/modules/config/tests/src/Functional/ConfigImportAllTest.php
+++ b/core/modules/config/tests/src/Functional/ConfigImportAllTest.php
@@ -136,8 +136,7 @@ class ConfigImportAllTest extends ModuleTestBase {
     // Ensure that we have no configuration changes to import.
     $storage_comparer = new StorageComparer(
       $this->container->get('config.storage.sync'),
-      $this->container->get('config.storage'),
-      $this->container->get('config.manager')
+      $this->container->get('config.storage')
     );
     $this->assertIdentical($storage_comparer->createChangelist()->getChangelist(), $storage_comparer->getEmptyChangelist());
 
diff --git a/core/modules/config/tests/src/Kernel/ConfigUninstallViaCliImportTest.php b/core/modules/config/tests/src/Kernel/ConfigUninstallViaCliImportTest.php
index 722546fe303..09f5d09aa3c 100644
--- a/core/modules/config/tests/src/Kernel/ConfigUninstallViaCliImportTest.php
+++ b/core/modules/config/tests/src/Kernel/ConfigUninstallViaCliImportTest.php
@@ -38,8 +38,7 @@ class ConfigUninstallViaCliImportTest extends KernelTestBase {
     // Set up the ConfigImporter object for testing.
     $storage_comparer = new StorageComparer(
       $this->container->get('config.storage.sync'),
-      $this->container->get('config.storage'),
-      $this->container->get('config.manager')
+      $this->container->get('config.storage')
     );
     $this->configImporter = new ConfigImporter(
       $storage_comparer->createChangelist(),
diff --git a/core/modules/content_translation/tests/src/Kernel/ContentTranslationConfigImportTest.php b/core/modules/content_translation/tests/src/Kernel/ContentTranslationConfigImportTest.php
index 0fe6b9f6e0b..6cbfe597acf 100644
--- a/core/modules/content_translation/tests/src/Kernel/ContentTranslationConfigImportTest.php
+++ b/core/modules/content_translation/tests/src/Kernel/ContentTranslationConfigImportTest.php
@@ -40,8 +40,7 @@ class ContentTranslationConfigImportTest extends KernelTestBase {
     // Set up the ConfigImporter object for testing.
     $storage_comparer = new StorageComparer(
       $this->container->get('config.storage.sync'),
-      $this->container->get('config.storage'),
-      $this->container->get('config.manager')
+      $this->container->get('config.storage')
     );
     $this->configImporter = new ConfigImporter(
       $storage_comparer->createChangelist(),
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigImportRecreateTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigImportRecreateTest.php
index fef464ed7f2..5b40e3318d0 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigImportRecreateTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigImportRecreateTest.php
@@ -39,8 +39,7 @@ class ConfigImportRecreateTest extends KernelTestBase {
     // Set up the ConfigImporter object for testing.
     $storage_comparer = new StorageComparer(
       $this->container->get('config.storage.sync'),
-      $this->container->get('config.storage'),
-      $this->container->get('config.manager')
+      $this->container->get('config.storage')
     );
     $this->configImporter = new ConfigImporter(
       $storage_comparer->createChangelist(),
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigImportRenameValidationTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigImportRenameValidationTest.php
index f52b3956ab9..7378da161e8 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigImportRenameValidationTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigImportRenameValidationTest.php
@@ -44,8 +44,7 @@ class ConfigImportRenameValidationTest extends KernelTestBase {
     // Set up the ConfigImporter object for testing.
     $storage_comparer = new StorageComparer(
       $this->container->get('config.storage.sync'),
-      $this->container->get('config.storage'),
-      $this->container->get('config.manager')
+      $this->container->get('config.storage')
     );
     $this->configImporter = new ConfigImporter(
       $storage_comparer->createChangelist(),
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigImporterMissingContentTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigImporterMissingContentTest.php
index db09e3f9f66..a4b08475634 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigImporterMissingContentTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigImporterMissingContentTest.php
@@ -44,8 +44,7 @@ class ConfigImporterMissingContentTest extends KernelTestBase {
     // Set up the ConfigImporter object for testing.
     $storage_comparer = new StorageComparer(
       $this->container->get('config.storage.sync'),
-      $this->container->get('config.storage'),
-      $this->container->get('config.manager')
+      $this->container->get('config.storage')
     );
     $this->configImporter = new ConfigImporter(
       $storage_comparer->createChangelist(),
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigImporterTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigImporterTest.php
index c8eb231a97c..6489b06799e 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigImporterTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigImporterTest.php
@@ -49,8 +49,7 @@ class ConfigImporterTest extends KernelTestBase {
     // Set up the ConfigImporter object for testing.
     $storage_comparer = new StorageComparer(
       $this->container->get('config.storage.sync'),
-      $this->container->get('config.storage'),
-      $this->container->get('config.manager')
+      $this->container->get('config.storage')
     );
     $this->configImporter = new ConfigImporter(
       $storage_comparer->createChangelist(),
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigSnapshotTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigSnapshotTest.php
index 645638d8323..4bc2e25f20a 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigSnapshotTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigSnapshotTest.php
@@ -38,13 +38,12 @@ class ConfigSnapshotTest extends KernelTestBase {
     $active = $this->container->get('config.storage');
     $sync = $this->container->get('config.storage.sync');
     $snapshot = $this->container->get('config.storage.snapshot');
-    $config_manager = $this->container->get('config.manager');
     $config_name = 'config_test.system';
     $config_key = 'foo';
     $new_data = 'foobar';
 
-    $active_snapshot_comparer = new StorageComparer($active, $snapshot, $config_manager);
-    $sync_snapshot_comparer = new StorageComparer($sync, $snapshot, $config_manager);
+    $active_snapshot_comparer = new StorageComparer($active, $snapshot);
+    $sync_snapshot_comparer = new StorageComparer($sync, $snapshot);
 
     // Verify that we have an initial snapshot that matches the active
     // configuration. This has to be true as no config should be installed.
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/ContentEntityNullStorageTest.php b/core/tests/Drupal/KernelTests/Core/Entity/ContentEntityNullStorageTest.php
index 001d9ba3dee..1b22b20a5ce 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/ContentEntityNullStorageTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/ContentEntityNullStorageTest.php
@@ -52,8 +52,7 @@ class ContentEntityNullStorageTest extends KernelTestBase {
     // Set up the ConfigImporter object for testing.
     $storage_comparer = new StorageComparer(
       $this->container->get('config.storage.sync'),
-      $this->container->get('config.storage'),
-      $this->container->get('config.manager')
+      $this->container->get('config.storage')
     );
     $config_importer = new ConfigImporter(
       $storage_comparer->createChangelist(),
diff --git a/core/tests/Drupal/Tests/ConfigTestTrait.php b/core/tests/Drupal/Tests/ConfigTestTrait.php
index 330ff470e29..5bab85949fe 100644
--- a/core/tests/Drupal/Tests/ConfigTestTrait.php
+++ b/core/tests/Drupal/Tests/ConfigTestTrait.php
@@ -22,8 +22,7 @@ trait ConfigTestTrait {
       // Set up the ConfigImporter object for testing.
       $storage_comparer = new StorageComparer(
         $this->container->get('config.storage.sync'),
-        $this->container->get('config.storage'),
-        $this->container->get('config.manager')
+        $this->container->get('config.storage')
       );
       $this->configImporter = new ConfigImporter(
         $storage_comparer,
diff --git a/core/tests/Drupal/Tests/Core/Config/StorageComparerTest.php b/core/tests/Drupal/Tests/Core/Config/StorageComparerTest.php
index 353e6d3c7b0..9a1dd596abb 100644
--- a/core/tests/Drupal/Tests/Core/Config/StorageComparerTest.php
+++ b/core/tests/Drupal/Tests/Core/Config/StorageComparerTest.php
@@ -22,11 +22,6 @@ class StorageComparerTest extends UnitTestCase {
    */
   protected $targetStorage;
 
-  /**
-   * @var \Drupal\Core\Config\ConfigManager|\PHPUnit_Framework_MockObject_MockObject
-   */
-  protected $configManager;
-
   /**
    * The storage comparer to test.
    *
@@ -44,8 +39,7 @@ class StorageComparerTest extends UnitTestCase {
   protected function setUp() {
     $this->sourceStorage = $this->getMock('Drupal\Core\Config\StorageInterface');
     $this->targetStorage = $this->getMock('Drupal\Core\Config\StorageInterface');
-    $this->configManager = $this->getMock('Drupal\Core\Config\ConfigManagerInterface');
-    $this->storageComparer = new StorageComparer($this->sourceStorage, $this->targetStorage, $this->configManager);
+    $this->storageComparer = new StorageComparer($this->sourceStorage, $this->targetStorage);
   }
 
   protected function getConfigData() {
@@ -244,4 +238,13 @@ class StorageComparerTest extends UnitTestCase {
     $this->assertEmpty($this->storageComparer->getChangelist('delete'));
   }
 
+  /**
+   * @expectedDeprecation The storage comparer does not need a config manager. The parameter is deprecated since version 8.7.0 and will be removed in 9.0.0. Omit the third parameter. See https://www.drupal.org/node/2993271.
+   * @group legacy
+   */
+  public function testConfigManagerDeprecation() {
+    $configManager = $this->getMock('Drupal\Core\Config\ConfigManagerInterface');
+    new StorageComparer($this->sourceStorage, $this->targetStorage, $configManager);
+  }
+
 }