diff -u b/core/modules/link/src/Plugin/migrate/cckfield/LinkField.php b/core/modules/link/src/Plugin/migrate/cckfield/LinkField.php
--- b/core/modules/link/src/Plugin/migrate/cckfield/LinkField.php
+++ b/core/modules/link/src/Plugin/migrate/cckfield/LinkField.php
@@ -17,6 +17,9 @@
  *     "link_field" = "link"
  *   }
  * )
+ *
+ * @deprecated in Drupal 8.4.x and will be removed in Drupal 9.0.x. Use
+ *   \Drupal\link\Plugin\migrate\field\d7\FileField instead.
  */
 class LinkField extends CckFieldPluginBase {
 
diff -u b/core/modules/link/tests/src/Unit/Plugin/migrate/cckfield/LinkCckTest.php b/core/modules/link/tests/src/Unit/Plugin/migrate/cckfield/LinkCckTest.php
--- b/core/modules/link/tests/src/Unit/Plugin/migrate/cckfield/LinkCckTest.php
+++ b/core/modules/link/tests/src/Unit/Plugin/migrate/cckfield/LinkCckTest.php
@@ -10,6 +10,7 @@
 /**
  * @coversDefaultClass \Drupal\link\Plugin\migrate\cckfield\LinkField
  * @group link
+ * @group legacy
  */
 class LinkCckTest extends UnitTestCase {
 
reverted:
--- b/core/modules/link/tests/src/Unit/Plugin/migrate/cckfield/d7/LinkCckTest.php
+++ /dev/null
@@ -1,65 +0,0 @@
-<?php
-
-namespace Drupal\Tests\link\Unit\Plugin\migrate\cckfield\d7;
-
-use Drupal\migrate\Plugin\MigrationInterface;
-use Drupal\Tests\UnitTestCase;
-use Drupal\link\Plugin\migrate\cckfield\LinkField;
-use Prophecy\Argument;
-
-/**
- * @coversDefaultClass \Drupal\link\Plugin\migrate\cckfield\d7\LinkField
- * @group link
- */
-class LinkCckTest extends UnitTestCase {
-
-  /**
-   * @var \Drupal\migrate_drupal\Plugin\MigrateCckFieldInterface
-   */
-  protected $plugin;
-
-  /**
-   * @var \Drupal\migrate\Plugin\MigrationInterface
-   */
-  protected $migration;
-
-  /**
-   * {@inheritdoc}
-   */
-  protected function setUp() {
-    $this->plugin = new LinkField([], 'link', []);
-
-    $migration = $this->prophesize(MigrationInterface::class);
-
-    // The plugin's processFieldInstance() method will call
-    // mergeProcessOfProperty() and return nothing. So, in order to examine the
-    // process pipeline created by the plugin, we need to ensure that
-    // getProcess() always returns the last input to mergeProcessOfProperty().
-    $migration->mergeProcessOfProperty(Argument::type('string'), Argument::type('array'))
-      ->will(function($arguments) use ($migration) {
-        $migration->getProcess()->willReturn($arguments[1]);
-      });
-
-    $this->migration = $migration->reveal();
-  }
-
-  /**
-   * @covers ::processFieldInstance
-   */
-  public function testProcessFieldInstance() {
-    $this->plugin->processFieldInstance($this->migration);
-
-    $expected = [
-      'plugin' => 'static_map',
-      'source' => 'instance_settings/title',
-      'bypass' => TRUE,
-      'map' => [
-        'disabled' => DRUPAL_DISABLED,
-        'optional' => DRUPAL_OPTIONAL,
-        'required' => DRUPAL_REQUIRED,
-      ],
-    ];
-    $this->assertSame($expected, $this->migration->getProcess());
-  }
-
-}
reverted:
--- b/core/modules/link/tests/src/Unit/Plugin/migrate/field/d7/LinkFieldTest.php
+++ /dev/null
@@ -1,65 +0,0 @@
-<?php
-
-namespace Drupal\Tests\link\Unit\Plugin\migrate\field\d7;
-
-use Drupal\migrate\Plugin\MigrationInterface;
-use Drupal\Tests\UnitTestCase;
-use Drupal\link\Plugin\migrate\field\d7\LinkField;
-use Prophecy\Argument;
-
-/**
- * @coversDefaultClass \Drupal\link\Plugin\migrate\field\d7\LinkField
- * @group link
- */
-class LinkFieldTest extends UnitTestCase {
-
-  /**
-   * @var \Drupal\migrate_drupal\Plugin\MigrateFieldInterface
-   */
-  protected $plugin;
-
-  /**
-   * @var \Drupal\migrate\Plugin\MigrationInterface
-   */
-  protected $migration;
-
-  /**
-   * {@inheritdoc}
-   */
-  protected function setUp() {
-    $this->plugin = new LinkField([], 'link', []);
-
-    $migration = $this->prophesize(MigrationInterface::class);
-
-    // The plugin's ProcessFieldInstance() method will call
-    // mergeProcessOfProperty() and return nothing. So, in order to examine the
-    // process pipeline created by the plugin, we need to ensure that
-    // getProcess() always returns the last input to mergeProcessOfProperty().
-    $migration->mergeProcessOfProperty(Argument::type('string'), Argument::type('array'))
-      ->will(function($arguments) use ($migration) {
-        $migration->getProcess()->willReturn($arguments[1]);
-      });
-
-    $this->migration = $migration->reveal();
-  }
-
-  /**
-   * @covers ::processFieldInstance
-   */
-  public function testProcessFieldInstance() {
-    $this->plugin->processFieldInstance($this->migration);
-
-    $expected = [
-      'plugin' => 'static_map',
-      'source' => 'instance_settings/title',
-      'bypass' => TRUE,
-      'map' => [
-        'disabled' => DRUPAL_DISABLED,
-        'optional' => DRUPAL_OPTIONAL,
-        'required' => DRUPAL_REQUIRED,
-      ],
-    ];
-    $this->assertSame($expected, $this->migration->getProcess());
-  }
-
-}