diff --git a/src/Rector/Laravel/DisallowedLegacyCollectionArraySyntaxRector.php b/src/Rector/Laravel/DisallowedLegacyCollectionArraySyntaxRector.php
new file mode 100644
index 0000000..12d5a86
--- /dev/null
+++ b/src/Rector/Laravel/DisallowedLegacyCollectionArraySyntaxRector.php
@@ -0,0 +1,72 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Worksome\CodingStyle\Rector\Laravel;
+
+use PhpParser\Comment\Doc;
+use PhpParser\Node;
+use PhpParser\Node\Stmt\Class_;
+use PhpParser\Node\Stmt\ClassMethod;
+use PhpParser\Node\Stmt\Property;
+use Rector\Rector\AbstractRector;
+use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample;
+use Symplify\RuleDocGenerator\ValueObject\RuleDefinition;
+
+class DisallowedLegacyCollectionArraySyntaxRector extends AbstractRector
+{
+    public function getRuleDefinition(): RuleDefinition
+    {
+        return new RuleDefinition(
+            'PHPDoc `Collection` types must not use the legacy array syntax.',
+            [
+                new CodeSample(
+                    <<<PHP
+                    /** @property Collection|Model[] \$models */
+                    class MyClass {}
+                    PHP,
+                    <<<PHP
+                    /** @property Collection<int, Model> \$models */
+                    class MyClass {}
+                    PHP,
+                ),
+            ]
+        );
+    }
+
+    /** {@inheritdoc} */
+    public function getNodeTypes(): array
+    {
+        return [Property::class, ClassMethod::class, Class_::class];
+    }
+
+    /** {@inheritdoc} */
+    public function refactor(Node $node): Node|null
+    {
+        $docComment = $node->getDocComment();
+
+        if (null === $docComment) {
+            return null;
+        }
+
+        $originalText = $docComment->getText();
+        $transformedText = $this->transformDocComment($originalText);
+
+        if ($originalText === $transformedText) {
+            return null;
+        }
+
+        $node->setDocComment(new Doc($transformedText));
+
+        return $node;
+    }
+
+    protected function transformDocComment(string $docComment): string
+    {
+        return preg_replace(
+            pattern: '#(\\\\?(?:Illuminate\\\\Database\\\\Eloquent\\\\)?Collection)\|([^\s\[\]]+)\[]#',
+            replacement: '$1<int, $2>',
+            subject: $docComment
+        );
+    }
+}
diff --git a/tests/Rector/DisallowedAttributesRector/DisallowedAttributesRectorTest.php b/tests/Rector/Generic/DisallowedAttributesRector/DisallowedAttributesRectorTest.php
similarity index 100%
rename from tests/Rector/DisallowedAttributesRector/DisallowedAttributesRectorTest.php
rename to tests/Rector/Generic/DisallowedAttributesRector/DisallowedAttributesRectorTest.php
diff --git a/tests/Rector/DisallowedAttributesRector/Fixture/class_with_allowed_attribute.php.inc b/tests/Rector/Generic/DisallowedAttributesRector/Fixture/class_with_allowed_attribute.php.inc
similarity index 100%
rename from tests/Rector/DisallowedAttributesRector/Fixture/class_with_allowed_attribute.php.inc
rename to tests/Rector/Generic/DisallowedAttributesRector/Fixture/class_with_allowed_attribute.php.inc
diff --git a/tests/Rector/DisallowedAttributesRector/Fixture/class_with_disallowed_attribute.php.inc b/tests/Rector/Generic/DisallowedAttributesRector/Fixture/class_with_disallowed_attribute.php.inc
similarity index 100%
rename from tests/Rector/DisallowedAttributesRector/Fixture/class_with_disallowed_attribute.php.inc
rename to tests/Rector/Generic/DisallowedAttributesRector/Fixture/class_with_disallowed_attribute.php.inc
diff --git a/tests/Rector/DisallowedAttributesRector/Fixture/class_with_disallowed_attribute_in_group.php.inc b/tests/Rector/Generic/DisallowedAttributesRector/Fixture/class_with_disallowed_attribute_in_group.php.inc
similarity index 100%
rename from tests/Rector/DisallowedAttributesRector/Fixture/class_with_disallowed_attribute_in_group.php.inc
rename to tests/Rector/Generic/DisallowedAttributesRector/Fixture/class_with_disallowed_attribute_in_group.php.inc
diff --git a/tests/Rector/DisallowedAttributesRector/config/configured_rule.php b/tests/Rector/Generic/DisallowedAttributesRector/config/configured_rule.php
similarity index 100%
rename from tests/Rector/DisallowedAttributesRector/config/configured_rule.php
rename to tests/Rector/Generic/DisallowedAttributesRector/config/configured_rule.php
diff --git a/tests/Rector/Laravel/DisallowedLegacyCollectionArraySyntaxRector/DisallowedLegacyCollectionArraySyntaxRectorTest.php b/tests/Rector/Laravel/DisallowedLegacyCollectionArraySyntaxRector/DisallowedLegacyCollectionArraySyntaxRectorTest.php
new file mode 100644
index 0000000..9209899
--- /dev/null
+++ b/tests/Rector/Laravel/DisallowedLegacyCollectionArraySyntaxRector/DisallowedLegacyCollectionArraySyntaxRectorTest.php
@@ -0,0 +1,13 @@
+<?php
+
+it('can replace disallowed Collection syntax', function () {
+    $this->doTestFile(
+        __DIR__ . '/Fixture/class_with_disallowed_collection_syntax.php.inc'
+    );
+});
+
+it('does not replace allowed Collection syntax', function () {
+    $this->doTestFile(
+        __DIR__ . '/Fixture/class_with_allowed_collection_syntax.php.inc'
+    );
+});
diff --git a/tests/Rector/Laravel/DisallowedLegacyCollectionArraySyntaxRector/Fixture/class_with_allowed_collection_syntax.php.inc b/tests/Rector/Laravel/DisallowedLegacyCollectionArraySyntaxRector/Fixture/class_with_allowed_collection_syntax.php.inc
new file mode 100644
index 0000000..bdf8638
--- /dev/null
+++ b/tests/Rector/Laravel/DisallowedLegacyCollectionArraySyntaxRector/Fixture/class_with_allowed_collection_syntax.php.inc
@@ -0,0 +1,11 @@
+<?php
+
+namespace Worksome\CodingStyle\Tests\Rector\DisallowedAttributesRector\Fixture;
+
+use Illuminate\Database\Eloquent\Collection;
+use Illuminate\Database\Eloquent\Model;
+
+/** @property Collection<int, Model> $models */
+class ClassWithAllowedCollectionSyntax {}
+
+?>
diff --git a/tests/Rector/Laravel/DisallowedLegacyCollectionArraySyntaxRector/Fixture/class_with_disallowed_collection_syntax.php.inc b/tests/Rector/Laravel/DisallowedLegacyCollectionArraySyntaxRector/Fixture/class_with_disallowed_collection_syntax.php.inc
new file mode 100644
index 0000000..d1fd025
--- /dev/null
+++ b/tests/Rector/Laravel/DisallowedLegacyCollectionArraySyntaxRector/Fixture/class_with_disallowed_collection_syntax.php.inc
@@ -0,0 +1,35 @@
+<?php
+
+namespace Worksome\CodingStyle\Tests\Rector\DisallowedAttributesRector\Fixture;
+
+use Illuminate\Database\Eloquent\Collection;
+use Illuminate\Database\Eloquent\Collection as EloquentCollection;
+use Illuminate\Database\Eloquent\Model;
+
+/**
+ * @property Collection<int, Model> $models_valid (ensures valid syntax is not touched)
+ * @property Collection|Model[] $models_invalid_a
+ * @property \Illuminate\Database\Eloquent\Collection|Model[] $models_invalid_b
+ * @property EloquentCollection|Model[] $models_invalid_c
+ */
+class ClassWithAllowedCollectionSyntax {}
+
+?>
+-----
+<?php
+
+namespace Worksome\CodingStyle\Tests\Rector\DisallowedAttributesRector\Fixture;
+
+use Illuminate\Database\Eloquent\Collection;
+use Illuminate\Database\Eloquent\Collection as EloquentCollection;
+use Illuminate\Database\Eloquent\Model;
+
+/**
+ * @property Collection<int, Model> $models_valid (ensures valid syntax is not touched)
+ * @property Collection<int, Model> $models_invalid_a
+ * @property \Illuminate\Database\Eloquent\Collection<int, Model> $models_invalid_b
+ * @property EloquentCollection<int, Model> $models_invalid_c
+ */
+class ClassWithAllowedCollectionSyntax {}
+
+?>
diff --git a/tests/Rector/Laravel/DisallowedLegacyCollectionArraySyntaxRector/config/configured_rule.php b/tests/Rector/Laravel/DisallowedLegacyCollectionArraySyntaxRector/config/configured_rule.php
new file mode 100644
index 0000000..10ab21a
--- /dev/null
+++ b/tests/Rector/Laravel/DisallowedLegacyCollectionArraySyntaxRector/config/configured_rule.php
@@ -0,0 +1,11 @@
+<?php
+
+declare(strict_types=1);
+
+use Rector\Config\RectorConfig;
+use Worksome\CodingStyle\Rector\Laravel\DisallowedLegacyCollectionArraySyntaxRector;
+
+return static function (RectorConfig $rectorConfig): void {
+    $rectorConfig
+        ->rule(DisallowedLegacyCollectionArraySyntaxRector::class);
+};