diff --git a/src/module-elasticsuite-core/Block/Adminhtml/Healthcheck/MenuDecorator.php b/src/module-elasticsuite-core/Block/Adminhtml/Healthcheck/MenuDecorator.php
new file mode 100644
index 000000000..91a9456f7
--- /dev/null
+++ b/src/module-elasticsuite-core/Block/Adminhtml/Healthcheck/MenuDecorator.php
@@ -0,0 +1,95 @@
+<?php
+/**
+ * DISCLAIMER
+ *
+ * Do not edit or add to this file if you wish to upgrade this module to newer versions in the future.
+ *
+ * @category  Smile
+ * @package   Smile\ElasticsuiteCore
+ * @author    Richard BAYET <richard.bayet@smile.fr>
+ * @copyright 2025 Smile
+ * @license   Open Software License ("OSL") v. 3.0
+ */
+
+namespace Smile\ElasticsuiteCore\Block\Adminhtml\Healthcheck;
+
+use Magento\Backend\Block\Template;
+use Magento\Directory\Helper\Data as DirectoryHelper;
+use Magento\Framework\Json\Helper\Data as JsonHelper;
+use Smile\ElasticsuiteCore\Api\Healthcheck\CheckInterface;
+use Smile\ElasticsuiteCore\Model\Healthcheck\HealthcheckList;
+
+/**
+ * Elasticsuite menu decorator block.
+ * Adds a failed/warning healthchecks counter next to Elasticsuite elements in the menu.
+ *
+ * @category Smile
+ * @package  Smile\ElasticsuiteCore
+ */
+class MenuDecorator extends Template
+{
+    /** @var HealthcheckList */
+    private $healthcheckList;
+
+    /** @var integer */
+    private $issuesCount;
+
+    /**
+     * Constructor.
+     *
+     * @param HealthcheckList      $healthcheckList Healthchecks list.
+     * @param Template\Context     $context         Template context.
+     * @param array                $data            Data.
+     * @param JsonHelper|null      $jsonHelper      Json helper.
+     * @param DirectoryHelper|null $directoryHelper Directory helper.
+     */
+    public function __construct(
+        HealthcheckList $healthcheckList,
+        Template\Context $context,
+        array $data = [],
+        ?JsonHelper $jsonHelper = null,
+        ?DirectoryHelper $directoryHelper = null
+    ) {
+        parent::__construct($context, $data, $jsonHelper, $directoryHelper);
+        $this->healthcheckList = $healthcheckList;
+    }
+
+    /**
+     * Returns true if the menu decoration should happen.
+     *
+     * @return bool
+     */
+    public function isEnabled()
+    {
+        return $this->getIssuesCount() > 0;
+    }
+
+    /**
+     * Returns the number of failed tests.
+     *
+     * @return int
+     */
+    public function getIssuesCount()
+    {
+        if (null === $this->issuesCount) {
+            $this->issuesCount = 0;
+
+            foreach ($this->healthcheckList->getChecks() as $check) {
+                if ($check->getStatus() === CheckInterface::WARNING_STATUS) {
+                    $this->issuesCount++;
+                }
+            }
+        }
+
+        return $this->issuesCount;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    protected function getCacheLifetime()
+    {
+        // Very short cache TTL until a proper cache mechanism is set up at the healthcheck list level.
+        return 60;
+    }
+}
diff --git a/src/module-elasticsuite-core/view/adminhtml/layout/default.xml b/src/module-elasticsuite-core/view/adminhtml/layout/default.xml
index b87da116a..cc09a5c98 100644
--- a/src/module-elasticsuite-core/view/adminhtml/layout/default.xml
+++ b/src/module-elasticsuite-core/view/adminhtml/layout/default.xml
@@ -26,6 +26,9 @@
                     <block class="Smile\ElasticsuiteCore\Block\Adminhtml\System\Version" after="version" name="es-version" as="es-version" />
                 </referenceContainer>
             </referenceContainer>
+            <block class="Smile\ElasticsuiteCore\Block\Adminhtml\Healthcheck\MenuDecorator"
+                   name="healthcheck.menu_decorator"
+                   template="Smile_ElasticsuiteCore::healthcheck/menu_decorator.phtml" />
         </referenceContainer>
     </body>
 </page>
diff --git a/src/module-elasticsuite-core/view/adminhtml/templates/healthcheck/menu_decorator.phtml b/src/module-elasticsuite-core/view/adminhtml/templates/healthcheck/menu_decorator.phtml
new file mode 100644
index 000000000..5885c59d3
--- /dev/null
+++ b/src/module-elasticsuite-core/view/adminhtml/templates/healthcheck/menu_decorator.phtml
@@ -0,0 +1,28 @@
+<?php
+/**
+ * Healthcheck menu decorator block
+ *
+ * DISCLAIMER
+ *
+ * Do not edit or add to this file if you wish to upgrade Smile ElasticSuite to newer versions in the future.
+ *
+ * @category  Smile
+ * @package   Smile\ElasticsuiteCore
+ * @author    Richard BAYET <richard.bayet@smile.fr>
+ * @copyright 2025 Smile
+ * @license   Open Software License ("OSL") v. 3.0
+ */
+
+/** @var \Smile\ElasticsuiteCore\Block\Adminhtml\Healthcheck\MenuDecorator $block */
+?>
+<?php if ($block->isEnabled()): ?>
+<script type="text/javascript">
+    require(["jquery"], function ($) {
+        $('nav').on('globalnavigationcreate', function () {
+            let counter = '<span class="healthchecks-warning-counter">' + <?= (int) $block->getIssuesCount() ?>  + '</span>';
+            $('#menu-smile-elasticsuitecore-elasticsuite-menu a').first().append(counter);
+            $('#menu-smile-elasticsuitecore-elasticsuite-menu .item-healthcheck a').first().append(counter);
+        });
+    });
+</script>
+<?php endif; ?>
diff --git a/src/module-elasticsuite-core/view/adminhtml/web/css/source/_module.less b/src/module-elasticsuite-core/view/adminhtml/web/css/source/_module.less
index 620cca5bd..2fc833330 100644
--- a/src/module-elasticsuite-core/view/adminhtml/web/css/source/_module.less
+++ b/src/module-elasticsuite-core/view/adminhtml/web/css/source/_module.less
@@ -53,3 +53,33 @@ fieldset.radioset-tooltip {
     }
 }
 
+#nav {
+    #menu-smile-elasticsuitecore-elasticsuite-menu {
+        span.healthchecks-warning-counter {
+            background-color: @color-tomato-brick;;
+            border-radius: 1em;
+            color: @color-white;;
+            display: inline-block;
+            font-size: round(@font-size__s - .1rem, 1);
+            font-weight: @font-weight__bold;
+            height: 20px;
+            left: 50%;
+            line-height: 20px;
+            margin-left: .3em;
+            margin-top: -1.1em;
+            min-width: 20px;
+            position: absolute;
+            text-align: center;
+            top: 50%;
+        }
+
+        .item-healthcheck {
+            span.healthchecks-warning-counter {
+                position: static;
+                top: inherit;
+                margin-left: 5px;
+            }
+        }
+    }
+}
+