diff --git a/lib/Controller/API/App/GetSegmentsController.php b/lib/Controller/API/App/GetSegmentsController.php
index c4db3e7b70..505f7f6851 100644
--- a/lib/Controller/API/App/GetSegmentsController.php
+++ b/lib/Controller/API/App/GetSegmentsController.php
@@ -25,6 +25,7 @@
 use ReflectionException;
 use Utils\TaskRunner\Exceptions\EndQueueException;
 use Utils\TaskRunner\Exceptions\ReQueueException;
+use Utils\LQA\ICUSourceSegmentDetector;
 use Utils\Tools\CatUtils;
 
 class GetSegmentsController extends KleinController
@@ -127,7 +128,7 @@ public function segments(): void
                     language: $job->source,
                     patternString: $seg['segment']
                 );
-                $string_contains_icu = $analyzer->containsComplexSyntax() && $analyzer->isValidSyntax();
+                $string_contains_icu = ICUSourceSegmentDetector::sourceContainsIcu($analyzer, $icu_enabled);
             }
 
             /** @var MateCatFilter $Filter */
diff --git a/lib/Model/ProjectCreation/ProjectManager.php b/lib/Model/ProjectCreation/ProjectManager.php
index bccb47f2f3..e7fa49f1d1 100644
--- a/lib/Model/ProjectCreation/ProjectManager.php
+++ b/lib/Model/ProjectCreation/ProjectManager.php
@@ -32,6 +32,7 @@
 use Plugins\Features\SecondPassReview;
 use ReflectionException;
 use Throwable;
+use TypeError;
 use Utils\ActiveMQ\AMQHandler;
 use Utils\ActiveMQ\WorkerClient;
 use Utils\AsyncTasks\Workers\ActivityLogWorker;
@@ -215,7 +216,11 @@ protected function getJobCreationService(): JobCreationService
      */
     protected function getQAProcessor(): QAProcessor
     {
-        return $this->qaProcessor ??= new QAProcessor($this->filter, $this->features);
+        return $this->qaProcessor ??= new QAProcessor(
+            $this->filter,
+            $this->features,
+            (bool) ($this->projectStructure->metadata[ProjectsMetadataMarshaller::ICU_ENABLED->value] ?? false),
+        );
     }
 
     /**
@@ -1017,6 +1022,7 @@ protected function storeSegments(int $fid): void
 
     /**
      * @throws Exception
+     * @throws TypeError
      */
     private function insertSegmentNotesForFile(): void
     {
diff --git a/lib/Model/ProjectCreation/QAProcessor.php b/lib/Model/ProjectCreation/QAProcessor.php
index 301fd64a40..d1257623c2 100644
--- a/lib/Model/ProjectCreation/QAProcessor.php
+++ b/lib/Model/ProjectCreation/QAProcessor.php
@@ -2,8 +2,12 @@
 
 namespace Model\ProjectCreation;
 
+use Exception;
+use Matecat\ICU\MessagePatternComparator;
+use Matecat\ICU\MessagePatternValidator;
 use Matecat\SubFiltering\MateCatFilter;
 use Model\FeaturesBase\FeatureSet;
+use Utils\LQA\ICUSourceSegmentDetector;
 use Utils\LQA\QA;
 
 /**
@@ -13,6 +17,10 @@
  * selects the appropriate target string, converts back to Layer 0, and writes the results
  * onto each {@see TranslationTuple} in place.
  *
+ * When ICU is enabled for the project, the processor also detects ICU MessageFormat
+ * patterns in each segment and passes a {@see MessagePatternComparator} to QA so that
+ * ICU consistency is validated alongside tag checks.
+ *
  * Produces 4 scalars per tuple:
  * - translationLayer0: the QA-processed target (Layer 0)
  * - suggestionLayer0: same as translationLayer0 (may diverge in future)
@@ -24,6 +32,7 @@ class QAProcessor
     public function __construct(
         private readonly MateCatFilter $filter,
         private readonly FeatureSet $features,
+        private readonly bool $icuEnabled = false,
     ) {
     }
 
@@ -35,6 +44,8 @@ public function __construct(
      * @param ProjectStructure $projectStructure contains translations to process
      * @param string $sourceLang source language code (e.g. 'en-US')
      * @param string $targetLang target language code (e.g. 'it-IT')
+     *
+     * @throws Exception
      */
     public function process(
         ProjectStructure $projectStructure,
@@ -50,7 +61,14 @@ public function process(
                 $source = $this->filter->fromLayer0ToLayer1($tuple->source);
                 $target = $this->filter->fromLayer0ToLayer1($tuple->target);
 
-                $check = $this->createQA($source, $target);
+                [$comparator, $sourceContainsIcu] = $this->detectIcu(
+                    $sourceLang,
+                    $targetLang,
+                    $tuple->source,
+                    $tuple->target,
+                );
+
+                $check = $this->createQA($source, $target, $comparator, $sourceContainsIcu);
                 $check->setFeatureSet($this->features);
                 $check->setSourceSegLang($sourceLang);
                 $check->setTargetSegLang($targetLang);
@@ -70,12 +88,62 @@ public function process(
         }
     }
 
+    /**
+     * Detect ICU MessageFormat patterns in the source segment.
+     *
+     * Uses the raw Layer 0 content for detection because curly-bracket filter
+     * handlers are disabled by default at project-creation time, so ICU syntax
+     * survives the L0→L1 round-trip.
+     *
+     * @param string $sourceLang source language code
+     * @param string $targetLang target language code
+     * @param string $rawSource  raw Layer 0 source content
+     * @param string $rawTarget  raw Layer 0 target content
+     *
+     * @return array{0: ?MessagePatternComparator, 1: bool}
+     *         [comparator (null when ICU is not detected), sourceContainsIcu flag]
+     */
+    private function detectIcu(
+        string $sourceLang,
+        string $targetLang,
+        string $rawSource,
+        string $rawTarget,
+    ): array {
+        if (!$this->icuEnabled) {
+            return [null, false];
+        }
+
+        $sourceValidator = new MessagePatternValidator($sourceLang, $rawSource);
+
+        $sourceContainsIcu = ICUSourceSegmentDetector::sourceContainsIcu($sourceValidator, $this->icuEnabled);
+
+        if (!$sourceContainsIcu) {
+            return [null, false];
+        }
+
+        $targetValidator = new MessagePatternValidator($targetLang, $rawTarget);
+
+        return [
+            MessagePatternComparator::fromValidators($sourceValidator, $targetValidator),
+            true,
+        ];
+    }
+
     /**
      * Create a new QA instance.
      * Protected so test subclasses can override to inject stubs.
+     *
+     * @param string                        $source            Layer 1 source segment
+     * @param string                        $target            Layer 1 target segment
+     * @param MessagePatternComparator|null $comparator        ICU pattern comparator (null when ICU not detected)
+     * @param bool                          $sourceContainsIcu whether the source contains ICU patterns
      */
-    protected function createQA(string $source, string $target): QA
-    {
-        return new QA($source, $target);
+    protected function createQA(
+        string $source,
+        string $target,
+        ?MessagePatternComparator $comparator = null,
+        bool $sourceContainsIcu = false,
+    ): QA {
+        return new QA($source, $target, $comparator, $sourceContainsIcu);
     }
 }
diff --git a/lib/Utils/LQA/ICUSourceSegmentChecker.php b/lib/Utils/LQA/ICUSourceSegmentChecker.php
index 8a99d9760e..229664aa3b 100644
--- a/lib/Utils/LQA/ICUSourceSegmentChecker.php
+++ b/lib/Utils/LQA/ICUSourceSegmentChecker.php
@@ -44,9 +44,10 @@ private function sourceContainsIcu(ProjectStruct $projectStruct, JobStruct $chun
             $sourceSegment,
         );
 
-        if ($this->icuEnabled($projectStruct)) {
-            $this->sourceContainsIcu = $this->icuSourcePatternValidator->containsComplexSyntax() && $this->icuSourcePatternValidator->isValidSyntax();
-        }
+        $this->sourceContainsIcu = ICUSourceSegmentDetector::sourceContainsIcu(
+            $this->icuSourcePatternValidator,
+            $this->icuEnabled($projectStruct)
+        );
 
         return $this->sourceContainsIcu;
 
@@ -66,4 +67,4 @@ private function icuEnabled(ProjectStruct $projectStruct): bool
         return $this->icuEnabled = $projectStruct->getMetadataValue(ProjectsMetadataMarshaller::ICU_ENABLED->value) ?? false;
     }
 
-}
\ No newline at end of file
+}
diff --git a/lib/Utils/LQA/ICUSourceSegmentDetector.php b/lib/Utils/LQA/ICUSourceSegmentDetector.php
new file mode 100644
index 0000000000..0352f755ec
--- /dev/null
+++ b/lib/Utils/LQA/ICUSourceSegmentDetector.php
@@ -0,0 +1,26 @@
+<?php
+
+namespace Utils\LQA;
+
+use Matecat\ICU\MessagePatternValidator;
+
+/**
+ * Shared ICU source-segment detection logic.
+ */
+final class ICUSourceSegmentDetector
+{
+    /**
+     * Determines whether a source segment contains valid ICU MessageFormat patterns.
+     *
+     * @param MessagePatternValidator $validator ICU validator for the source segment
+     * @param bool                    $icuEnabled Whether ICU support is enabled for the current project
+     *
+     * @return bool True when ICU is enabled and the source has valid complex ICU syntax
+     */
+    public static function sourceContainsIcu(MessagePatternValidator $validator, bool $icuEnabled): bool
+    {
+        return $icuEnabled
+            && $validator->containsComplexSyntax()
+            && $validator->isValidSyntax();
+    }
+}
diff --git a/tests/unit/Model/ProjectCreation/QAProcessorTest.php b/tests/unit/Model/ProjectCreation/QAProcessorTest.php
index fd2f7a4424..c33bd3fcf8 100644
--- a/tests/unit/Model/ProjectCreation/QAProcessorTest.php
+++ b/tests/unit/Model/ProjectCreation/QAProcessorTest.php
@@ -50,7 +50,7 @@ protected function setUp(): void
      *
      * @throws MockException
      */
-    private function buildProcessor(?QA $qa = null): TestableQAProcessor
+    private function buildProcessor(?QA $qa = null, bool $icuEnabled = false): TestableQAProcessor
     {
         $filter = $this->createStub(MateCatFilter::class);
         $filter->method('fromLayer0ToLayer1')
@@ -61,6 +61,7 @@ private function buildProcessor(?QA $qa = null): TestableQAProcessor
         $processor = new TestableQAProcessor(
             $filter,
             $this->createStub(FeatureSet::class),
+            $icuEnabled,
         );
 
         if ($qa !== null) {
@@ -247,4 +248,97 @@ public function appliesLayerConversions(): void
         // fromLayer1ToLayer0('L1:target text') → 'L0:L1:target text'
         $this->assertSame('L0:L1:target text', $tuple->translationLayer0);
     }
+
+    // ── Test 6: ICU enabled + ICU source → comparator passed to createQA ─
+
+    /**
+     * @throws MockException
+     */
+    #[Test]
+    public function passesComparatorWhenIcuEnabledAndSourceContainsIcu(): void
+    {
+        $qa = $this->buildQAStub(normalizedTarget: 'norm');
+
+        $icuSource = '{count, plural, one{# item} other{# items}}';
+        $icuTarget = '{count, plural, one{# elemento} other{# elementi}}';
+
+        $tuple = $this->makeTuple(source: $icuSource, target: $icuTarget);
+        $this->projectStructure->translations = [
+            'tu-1' => [0 => $tuple],
+        ];
+
+        $processor = $this->buildProcessor($qa, icuEnabled: true);
+        $processor->process($this->projectStructure, 'en-US', 'it-IT');
+
+        $this->assertNotNull($processor->lastComparator);
+        $this->assertTrue($processor->lastSourceContainsIcu);
+    }
+
+    // ── Test 7: ICU disabled + ICU source → no comparator ────────────
+
+    /**
+     * @throws MockException
+     */
+    #[Test]
+    public function skipsIcuDetectionWhenIcuDisabled(): void
+    {
+        $qa = $this->buildQAStub(normalizedTarget: 'norm');
+
+        $icuSource = '{count, plural, one{# item} other{# items}}';
+        $icuTarget = '{count, plural, one{# elemento} other{# elementi}}';
+
+        $tuple = $this->makeTuple(source: $icuSource, target: $icuTarget);
+        $this->projectStructure->translations = [
+            'tu-1' => [0 => $tuple],
+        ];
+
+        $processor = $this->buildProcessor($qa, icuEnabled: false);
+        $processor->process($this->projectStructure, 'en-US', 'it-IT');
+
+        $this->assertNull($processor->lastComparator);
+        $this->assertFalse($processor->lastSourceContainsIcu);
+    }
+
+    // ── Test 8: ICU enabled + non-ICU source → no comparator ─────────
+
+    /**
+     * @throws MockException
+     */
+    #[Test]
+    public function skipsIcuDetectionWhenSourceHasNoIcuPatterns(): void
+    {
+        $qa = $this->buildQAStub(normalizedTarget: 'norm');
+
+        $tuple = $this->makeTuple(source: 'plain source text', target: 'plain target text');
+        $this->projectStructure->translations = [
+            'tu-1' => [0 => $tuple],
+        ];
+
+        $processor = $this->buildProcessor($qa, icuEnabled: true);
+        $processor->process($this->projectStructure, 'en-US', 'it-IT');
+
+        $this->assertNull($processor->lastComparator);
+        $this->assertFalse($processor->lastSourceContainsIcu);
+    }
+
+    // ── Test 9: ICU enabled + broken target → QA reports ICU errors ──
+
+    #[Test]
+    public function reportsIcuValidationErrorsForBrokenTarget(): void
+    {
+        $icuSource = '{count, plural, one{# item} other{# items}}';
+        $brokenTarget = '{count, plural, one{# elemento}}';
+
+        $tuple = $this->makeTuple(source: $icuSource, target: $brokenTarget);
+        $this->projectStructure->translations = [
+            'tu-1' => [0 => $tuple],
+        ];
+
+        // No QA stub — uses real QA so ICU validation actually runs
+        $processor = $this->buildProcessor(icuEnabled: true);
+        $processor->process($this->projectStructure, 'en-US', 'it-IT');
+
+        $this->assertSame(1, $tuple->warning);
+        $this->assertNotEmpty($tuple->serializedErrors);
+    }
 }
diff --git a/tests/unit/Model/ProjectCreation/TestableQAProcessor.php b/tests/unit/Model/ProjectCreation/TestableQAProcessor.php
index 03dbefff55..3f27f0c8f0 100644
--- a/tests/unit/Model/ProjectCreation/TestableQAProcessor.php
+++ b/tests/unit/Model/ProjectCreation/TestableQAProcessor.php
@@ -2,6 +2,7 @@
 
 namespace unit\Model\ProjectCreation;
 
+use Matecat\ICU\MessagePatternComparator;
 use Model\ProjectCreation\QAProcessor;
 use Utils\LQA\QA;
 
@@ -12,19 +13,26 @@ class TestableQAProcessor extends QAProcessor
 {
     private ?QA $qaInstance = null;
 
-    /**
-     * Inject a QA stub/mock for tests.
-     */
+    /** @var ?MessagePatternComparator Captures the comparator passed to the last createQA() call */
+    public ?MessagePatternComparator $lastComparator = null;
+
+    /** @var ?bool Captures the sourceContainsIcu flag passed to the last createQA() call */
+    public ?bool $lastSourceContainsIcu = null;
+
     public function setQA(QA $qa): void
     {
         $this->qaInstance = $qa;
     }
 
-    /**
-     * Override to return the injected QA instance instead of creating a real one.
-     */
-    protected function createQA(string $source, string $target): QA
-    {
-        return $this->qaInstance ?? parent::createQA($source, $target);
+    protected function createQA(
+        string $source,
+        string $target,
+        ?MessagePatternComparator $comparator = null,
+        bool $sourceContainsIcu = false,
+    ): QA {
+        $this->lastComparator        = $comparator;
+        $this->lastSourceContainsIcu = $sourceContainsIcu;
+
+        return $this->qaInstance ?? parent::createQA($source, $target, $comparator, $sourceContainsIcu);
     }
 }