diff --git a/rules-tests/Restoration/Rector/Property/MakeTypedPropertyNullableIfCheckedRector/Fixture/skip_on_constructor_assignment.php.inc b/rules-tests/Restoration/Rector/Property/MakeTypedPropertyNullableIfCheckedRector/Fixture/skip_on_constructor_assignment.php.inc
new file mode 100644
index 00000000000..6ac7629fffa
--- /dev/null
+++ b/rules-tests/Restoration/Rector/Property/MakeTypedPropertyNullableIfCheckedRector/Fixture/skip_on_constructor_assignment.php.inc
@@ -0,0 +1,22 @@
+<?php
+
+namespace Rector\Tests\Restoration\Rector\Property\MakeTypedPropertyNullableIfCheckedRector\Fixture;
+
+class SkipOnConstructorAssignment
+{
+    private string $message;
+
+    public function __construct()
+    {
+        $this->message = 'foo';
+    }
+
+    private function getMessage(): ?string
+    {
+        if (!$this->message) {
+            return null;
+        }
+
+        return $this->message;
+    }
+}
diff --git a/rules/Restoration/Rector/Property/MakeTypedPropertyNullableIfCheckedRector.php b/rules/Restoration/Rector/Property/MakeTypedPropertyNullableIfCheckedRector.php
index 8cc1b93c36e..8469ccce9a4 100644
--- a/rules/Restoration/Rector/Property/MakeTypedPropertyNullableIfCheckedRector.php
+++ b/rules/Restoration/Rector/Property/MakeTypedPropertyNullableIfCheckedRector.php
@@ -17,6 +17,7 @@
 use PhpParser\Node\Stmt\PropertyProperty;
 use Rector\Core\Rector\AbstractRector;
 use Rector\Privatization\NodeManipulator\VisibilityManipulator;
+use Rector\TypeDeclaration\AlreadyAssignDetector\ConstructorAssignDetector;
 use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample;
 use Symplify\RuleDocGenerator\ValueObject\RuleDefinition;
 
@@ -26,7 +27,8 @@
 final class MakeTypedPropertyNullableIfCheckedRector extends AbstractRector
 {
     public function __construct(
-        private readonly VisibilityManipulator $visibilityManipulator
+        private readonly VisibilityManipulator $visibilityManipulator,
+        private readonly ConstructorAssignDetector $constructorAssignDetector
     ) {
     }
 
@@ -90,7 +92,17 @@ public function refactor(Node $node): ?Node
             return null;
         }
 
-        $isPropertyNullChecked = $this->isPropertyNullChecked($onlyProperty);
+        $classLike = $this->betterNodeFinder->findParentType($onlyProperty, Class_::class);
+        if (! $classLike instanceof Class_) {
+            return null;
+        }
+
+        $isPropertyConstructorAssigned = $this->isPropertyConstructorAssigned($classLike, $onlyProperty);
+        if ($isPropertyConstructorAssigned) {
+            return null;
+        }
+
+        $isPropertyNullChecked = $this->isPropertyNullChecked($classLike, $onlyProperty);
         if (! $isPropertyNullChecked) {
             return null;
         }
@@ -127,18 +139,19 @@ private function shouldSkipProperty(Property $property): bool
         return $property->type instanceof NullableType;
     }
 
-    private function isPropertyNullChecked(PropertyProperty $onlyPropertyProperty): bool
+    private function isPropertyConstructorAssigned(Class_ $class, PropertyProperty $onlyPropertyProperty): bool
     {
-        $classLike = $this->betterNodeFinder->findParentType($onlyPropertyProperty, Class_::class);
-        if (! $classLike instanceof Class_) {
-            return false;
-        }
+        $propertyName = $this->nodeNameResolver->getName($onlyPropertyProperty);
+        return $this->constructorAssignDetector->isPropertyAssigned($class, $propertyName);
+    }
 
-        if ($this->isIdenticalOrNotIdenticalToNull($classLike, $onlyPropertyProperty)) {
+    private function isPropertyNullChecked(Class_ $class, PropertyProperty $onlyPropertyProperty): bool
+    {
+        if ($this->isIdenticalOrNotIdenticalToNull($class, $onlyPropertyProperty)) {
             return true;
         }
 
-        return $this->isBooleanNot($classLike, $onlyPropertyProperty);
+        return $this->isBooleanNot($class, $onlyPropertyProperty);
     }
 
     private function isIdenticalOrNotIdenticalToNull(Class_ $class, PropertyProperty $onlyPropertyProperty): bool