diff --git a/module/Core/functions/functions.php b/module/Core/functions/functions.php
index f26cb84f..586195da 100644
--- a/module/Core/functions/functions.php
+++ b/module/Core/functions/functions.php
@@ -26,7 +26,9 @@ use function print_r;
 use function Shlinkio\Shlink\Common\buildDateRange;
 use function sprintf;
 use function str_repeat;
+use function str_replace;
 use function strtolower;
+use function trim;
 use function ucfirst;
 
 function generateRandomShortCode(int $length, ShortUrlMode $mode = ShortUrlMode::STRICT): string
@@ -74,6 +76,11 @@ function normalizeDate(string|DateTimeInterface|Chronos $date): Chronos
     return normalizeOptionalDate($date);
 }
 
+function normalizeLocale(string $locale): string
+{
+    return trim(strtolower(str_replace('_', '-', $locale)));
+}
+
 function getOptionalIntFromInputFilter(InputFilter $inputFilter, string $fieldName): ?int
 {
     $value = $inputFilter->getValue($fieldName);
diff --git a/module/Core/src/RedirectRule/Entity/RedirectCondition.php b/module/Core/src/RedirectRule/Entity/RedirectCondition.php
index 367d96d9..72960d82 100644
--- a/module/Core/src/RedirectRule/Entity/RedirectCondition.php
+++ b/module/Core/src/RedirectRule/Entity/RedirectCondition.php
@@ -2,9 +2,14 @@
 
 namespace Shlinkio\Shlink\Core\RedirectRule\Entity;
 
+use Psr\Http\Message\ServerRequestInterface;
 use Shlinkio\Shlink\Common\Entity\AbstractEntity;
 use Shlinkio\Shlink\Core\RedirectRule\Model\RedirectConditionType;
 
+use function explode;
+use function Shlinkio\Shlink\Core\ArrayUtils\some;
+use function Shlinkio\Shlink\Core\normalizeLocale;
+
 class RedirectCondition extends AbstractEntity
 {
     public function __construct(
@@ -14,4 +19,28 @@ class RedirectCondition extends AbstractEntity
         public readonly ?string $matchKey = null,
     ) {
     }
+
+    /**
+     * Tells if this condition matches provided request
+     */
+    public function matchesRequest(ServerRequestInterface $request): bool
+    {
+        if ($this->type === RedirectConditionType::QUERY_PARAM && $this->matchKey !== null) {
+            $query = $request->getQueryParams();
+            $queryValue = $query[$this->matchKey] ?? null;
+            return $queryValue === $this->matchValue;
+        }
+
+        if ($this->type === RedirectConditionType::LANGUAGE && $request->hasHeader('Accept-Language')) {
+            $acceptedLanguages = explode(',', $request->getHeaderLine('Accept-Language'));
+            $normalizedLanguage = normalizeLocale($this->matchValue);
+
+            return some(
+                $acceptedLanguages,
+                static fn (string $lang) => normalizeLocale($lang) === $normalizedLanguage,
+            );
+        }
+
+        return false;
+    }
 }
diff --git a/module/Core/src/RedirectRule/Model/RedirectConditionType.php b/module/Core/src/RedirectRule/Model/RedirectConditionType.php
index 6e6b8113..764c5a2b 100644
--- a/module/Core/src/RedirectRule/Model/RedirectConditionType.php
+++ b/module/Core/src/RedirectRule/Model/RedirectConditionType.php
@@ -4,7 +4,7 @@ namespace Shlinkio\Shlink\Core\RedirectRule\Model;
 
 enum RedirectConditionType: string
 {
-    case DEVICE = 'device';
-//    case LANGUAGE = 'language';
-//    case QUERY_PARAM = 'query';
+//    case DEVICE = 'device';
+    case LANGUAGE = 'language';
+    case QUERY_PARAM = 'query';
 }