diff --git a/src/Symfony/Bundle/FrameworkBundle/Command/TranslationUpdateCommand.php b/src/Symfony/Bundle/FrameworkBundle/Command/TranslationUpdateCommand.php
index ee250f18f5dd..7da20f6394b1 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Command/TranslationUpdateCommand.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Command/TranslationUpdateCommand.php
@@ -12,6 +12,8 @@
 namespace Symfony\Bundle\FrameworkBundle\Command;
 
 use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Completion\CompletionInput;
+use Symfony\Component\Console\Completion\CompletionSuggestions;
 use Symfony\Component\Console\Exception\InvalidArgumentException;
 use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Input\InputInterface;
@@ -40,6 +42,10 @@ class TranslationUpdateCommand extends Command
     private const ASC = 'asc';
     private const DESC = 'desc';
     private const SORT_ORDERS = [self::ASC, self::DESC];
+    private const FORMATS = [
+        'xlf12' => ['xlf', '1.2'],
+        'xlf20' => ['xlf', '2.0'],
+    ];
 
     protected static $defaultName = 'translation:update';
     protected static $defaultDescription = 'Update the translation file';
@@ -52,8 +58,9 @@ class TranslationUpdateCommand extends Command
     private $defaultViewsPath;
     private $transPaths;
     private $codePaths;
+    private $enabledLocales;
 
-    public function __construct(TranslationWriterInterface $writer, TranslationReaderInterface $reader, ExtractorInterface $extractor, string $defaultLocale, string $defaultTransPath = null, string $defaultViewsPath = null, array $transPaths = [], array $codePaths = [])
+    public function __construct(TranslationWriterInterface $writer, TranslationReaderInterface $reader, ExtractorInterface $extractor, string $defaultLocale, string $defaultTransPath = null, string $defaultViewsPath = null, array $transPaths = [], array $codePaths = [], array $enabledLocales = [])
     {
         parent::__construct();
 
@@ -65,6 +72,7 @@ public function __construct(TranslationWriterInterface $writer, TranslationReade
         $this->defaultViewsPath = $defaultViewsPath;
         $this->transPaths = $transPaths;
         $this->codePaths = $codePaths;
+        $this->enabledLocales = $enabledLocales;
     }
 
     /**
@@ -147,10 +155,8 @@ protected function execute(InputInterface $input, OutputInterface $output): int
             trigger_deprecation('symfony/framework-bundle', '5.3', 'The "--output-format" option is deprecated, use "--format=xlf%d" instead.', 10 * $xliffVersion);
         }
 
-        switch ($format) {
-            case 'xlf20': $xliffVersion = '2.0';
-            // no break
-            case 'xlf12': $format = 'xlf';
+        if (\in_array($format, array_keys(self::FORMATS), true)) {
+            [$format, $xliffVersion] = self::FORMATS[$format];
         }
 
         // check format
@@ -165,15 +171,9 @@ protected function execute(InputInterface $input, OutputInterface $output): int
         $kernel = $this->getApplication()->getKernel();
 
         // Define Root Paths
-        $transPaths = $this->transPaths;
-        if ($this->defaultTransPath) {
-            $transPaths[] = $this->defaultTransPath;
-        }
-        $codePaths = $this->codePaths;
-        $codePaths[] = $kernel->getProjectDir().'/src';
-        if ($this->defaultViewsPath) {
-            $codePaths[] = $this->defaultViewsPath;
-        }
+        $transPaths = $this->getRootTransPaths();
+        $codePaths = $this->getRootCodePaths($kernel);
+
         $currentName = 'default directory';
 
         // Override with provided Bundle info
@@ -206,24 +206,11 @@ protected function execute(InputInterface $input, OutputInterface $output): int
         $io->title('Translation Messages Extractor and Dumper');
         $io->comment(sprintf('Generating "<info>%s</info>" translation files for "<info>%s</info>"', $input->getArgument('locale'), $currentName));
 
-        // load any messages from templates
-        $extractedCatalogue = new MessageCatalogue($input->getArgument('locale'));
         $io->comment('Parsing templates...');
-        $this->extractor->setPrefix($input->getOption('prefix'));
-        foreach ($codePaths as $path) {
-            if (is_dir($path) || is_file($path)) {
-                $this->extractor->extract($path, $extractedCatalogue);
-            }
-        }
+        $extractedCatalogue = $this->extractMessages($input->getArgument('locale'), $codePaths, $input->getOption('prefix'));
 
-        // load any existing messages from the translation files
-        $currentCatalogue = new MessageCatalogue($input->getArgument('locale'));
         $io->comment('Loading translation files...');
-        foreach ($transPaths as $path) {
-            if (is_dir($path)) {
-                $this->reader->read($path, $currentCatalogue);
-            }
-        }
+        $currentCatalogue = $this->loadCurrentMessages($input->getArgument('locale'), $transPaths);
 
         if (null !== $domain = $input->getOption('domain')) {
             $currentCatalogue = $this->filterCatalogue($currentCatalogue, $domain);
@@ -321,6 +308,60 @@ protected function execute(InputInterface $input, OutputInterface $output): int
         return 0;
     }
 
+    public function complete(CompletionInput $input, CompletionSuggestions $suggestions): void
+    {
+        if ($input->mustSuggestArgumentValuesFor('locale')) {
+            $suggestions->suggestValues($this->enabledLocales);
+
+            return;
+        }
+
+        /** @var KernelInterface $kernel */
+        $kernel = $this->getApplication()->getKernel();
+        if ($input->mustSuggestArgumentValuesFor('bundle')) {
+            $bundles = [];
+
+            foreach ($kernel->getBundles() as $bundle) {
+                $bundles[] = $bundle->getName();
+                if ($bundle->getContainerExtension()) {
+                    $bundles[] = $bundle->getContainerExtension()->getAlias();
+                }
+            }
+
+            $suggestions->suggestValues($bundles);
+
+            return;
+        }
+
+        if ($input->mustSuggestOptionValuesFor('format')) {
+            $suggestions->suggestValues(array_merge(
+                $this->writer->getFormats(),
+                array_keys(self::FORMATS)
+            ));
+
+            return;
+        }
+
+        if ($input->mustSuggestOptionValuesFor('domain') && $locale = $input->getArgument('locale')) {
+            $extractedCatalogue = $this->extractMessages($locale, $this->getRootCodePaths($kernel), $input->getOption('prefix'));
+
+            $currentCatalogue = $this->loadCurrentMessages($locale, $this->getRootTransPaths());
+
+            // process catalogues
+            $operation = $input->getOption('clean')
+                ? new TargetOperation($currentCatalogue, $extractedCatalogue)
+                : new MergeOperation($currentCatalogue, $extractedCatalogue);
+
+            $suggestions->suggestValues($operation->getDomains());
+
+            return;
+        }
+
+        if ($input->mustSuggestOptionValuesFor('sort')) {
+            $suggestions->suggestValues(self::SORT_ORDERS);
+        }
+    }
+
     private function filterCatalogue(MessageCatalogue $catalogue, string $domain): MessageCatalogue
     {
         $filteredCatalogue = new MessageCatalogue($catalogue->getLocale());
@@ -353,4 +394,50 @@ private function filterCatalogue(MessageCatalogue $catalogue, string $domain): M
 
         return $filteredCatalogue;
     }
+
+    private function extractMessages(string $locale, array $transPaths, string $prefix): MessageCatalogue
+    {
+        $extractedCatalogue = new MessageCatalogue($locale);
+        $this->extractor->setPrefix($prefix);
+        foreach ($transPaths as $path) {
+            if (is_dir($path) || is_file($path)) {
+                $this->extractor->extract($path, $extractedCatalogue);
+            }
+        }
+
+        return $extractedCatalogue;
+    }
+
+    private function loadCurrentMessages(string $locale, array $transPaths): MessageCatalogue
+    {
+        $currentCatalogue = new MessageCatalogue($locale);
+        foreach ($transPaths as $path) {
+            if (is_dir($path)) {
+                $this->reader->read($path, $currentCatalogue);
+            }
+        }
+
+        return $currentCatalogue;
+    }
+
+    private function getRootTransPaths(): array
+    {
+        $transPaths = $this->transPaths;
+        if ($this->defaultTransPath) {
+            $transPaths[] = $this->defaultTransPath;
+        }
+
+        return $transPaths;
+    }
+
+    private function getRootCodePaths(KernelInterface $kernel): array
+    {
+        $codePaths = $this->codePaths;
+        $codePaths[] = $kernel->getProjectDir().'/src';
+        if ($this->defaultViewsPath) {
+            $codePaths[] = $this->defaultViewsPath;
+        }
+
+        return $codePaths;
+    }
 }
diff --git a/src/Symfony/Bundle/FrameworkBundle/Resources/config/console.php b/src/Symfony/Bundle/FrameworkBundle/Resources/config/console.php
index 81af31d7260a..e4db50c81536 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Resources/config/console.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Resources/config/console.php
@@ -236,6 +236,7 @@
                 null, // twig.default_path
                 [], // Translator paths
                 [], // Twig paths
+                param('kernel.enabled_locales'),
             ])
             ->tag('console.command')
 
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Command/TranslationUpdateCommandCompletionTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Command/TranslationUpdateCommandCompletionTest.php
new file mode 100644
index 000000000000..7e09a6ffad89
--- /dev/null
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Command/TranslationUpdateCommandCompletionTest.php
@@ -0,0 +1,150 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Bundle\FrameworkBundle\Tests\Command;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Bundle\FrameworkBundle\Command\TranslationUpdateCommand;
+use Symfony\Bundle\FrameworkBundle\Console\Application;
+use Symfony\Component\Console\Tester\CommandCompletionTester;
+use Symfony\Component\DependencyInjection\Container;
+use Symfony\Component\Filesystem\Filesystem;
+use Symfony\Component\HttpKernel\Bundle\BundleInterface;
+use Symfony\Component\HttpKernel\KernelInterface;
+use Symfony\Component\HttpKernel\Tests\Fixtures\ExtensionPresentBundle\ExtensionPresentBundle;
+use Symfony\Component\Translation\Extractor\ExtractorInterface;
+use Symfony\Component\Translation\Reader\TranslationReader;
+use Symfony\Component\Translation\Translator;
+use Symfony\Component\Translation\Writer\TranslationWriter;
+
+class TranslationUpdateCommandCompletionTest extends TestCase
+{
+    private $fs;
+    private $translationDir;
+
+    /**
+     * @dataProvider provideCompletionSuggestions
+     */
+    public function testComplete(array $input, array $expectedSuggestions)
+    {
+        $tester = $this->createCommandCompletionTester(['messages' => ['foo' => 'foo']]);
+
+        $suggestions = $tester->complete($input);
+
+        $this->assertSame($expectedSuggestions, $suggestions);
+    }
+
+    public function provideCompletionSuggestions()
+    {
+        $bundle = new ExtensionPresentBundle();
+
+        yield 'locale' => [[''], ['en', 'fr']];
+        yield 'bundle' => [['en', ''], [$bundle->getName(), $bundle->getContainerExtension()->getAlias()]];
+        yield 'domain with locale' => [['en', '--domain=m'], ['messages']];
+        yield 'domain without locale' => [['--domain=m'], []];
+        yield 'format' => [['en', '--format='], ['php', 'xlf', 'po', 'mo', 'yml', 'yaml', 'ts', 'csv', 'ini', 'json', 'res', 'xlf12', 'xlf20']];
+        yield 'sort' => [['en', '--sort='], ['asc', 'desc']];
+    }
+
+    protected function setUp(): void
+    {
+        $this->fs = new Filesystem();
+        $this->translationDir = sys_get_temp_dir().'/'.uniqid('sf_translation', true);
+        $this->fs->mkdir($this->translationDir.'/translations');
+        $this->fs->mkdir($this->translationDir.'/templates');
+    }
+
+    protected function tearDown(): void
+    {
+        $this->fs->remove($this->translationDir);
+    }
+
+    private function createCommandCompletionTester($extractedMessages = [], $loadedMessages = [], KernelInterface $kernel = null, array $transPaths = [], array $codePaths = []): CommandCompletionTester
+    {
+        $translator = $this->createMock(Translator::class);
+        $translator
+            ->expects($this->any())
+            ->method('getFallbackLocales')
+            ->willReturn(['en']);
+
+        $extractor = $this->createMock(ExtractorInterface::class);
+        $extractor
+            ->expects($this->any())
+            ->method('extract')
+            ->willReturnCallback(
+                function ($path, $catalogue) use ($extractedMessages) {
+                    foreach ($extractedMessages as $domain => $messages) {
+                        $catalogue->add($messages, $domain);
+                    }
+                }
+            );
+
+        $loader = $this->createMock(TranslationReader::class);
+        $loader
+            ->expects($this->any())
+            ->method('read')
+            ->willReturnCallback(
+                function ($path, $catalogue) use ($loadedMessages) {
+                    $catalogue->add($loadedMessages);
+                }
+            );
+
+        $writer = $this->createMock(TranslationWriter::class);
+        $writer
+            ->expects($this->any())
+            ->method('getFormats')
+            ->willReturn(
+                ['php', 'xlf', 'po', 'mo', 'yml', 'yaml', 'ts', 'csv', 'ini', 'json', 'res']
+            );
+
+        if (null === $kernel) {
+            $returnValues = [
+                ['foo', $this->getBundle($this->translationDir)],
+                ['test', $this->getBundle('test')],
+            ];
+            $kernel = $this->createMock(KernelInterface::class);
+            $kernel
+                ->expects($this->any())
+                ->method('getBundle')
+                ->willReturnMap($returnValues);
+        }
+
+        $kernel
+            ->expects($this->any())
+            ->method('getBundles')
+            ->willReturn([new ExtensionPresentBundle()]);
+
+        $container = new Container();
+        $kernel
+            ->expects($this->any())
+            ->method('getContainer')
+            ->willReturn($container);
+
+        $command = new TranslationUpdateCommand($writer, $loader, $extractor, 'en', $this->translationDir.'/translations', $this->translationDir.'/templates', $transPaths, $codePaths, ['en', 'fr']);
+
+        $application = new Application($kernel);
+        $application->add($command);
+
+        return new CommandCompletionTester($application->find('translation:update'));
+    }
+
+    private function getBundle($path)
+    {
+        $bundle = $this->createMock(BundleInterface::class);
+        $bundle
+            ->expects($this->any())
+            ->method('getPath')
+            ->willReturn($path)
+        ;
+
+        return $bundle;
+    }
+}