diff --git a/addons/web/static/src/js/chrome/menu.js b/addons/web/static/src/js/chrome/menu.js
index 6f2815b670a..3c3530d49e9 100644
--- a/addons/web/static/src/js/chrome/menu.js
+++ b/addons/web/static/src/js/chrome/menu.js
@@ -69,6 +69,7 @@ var Menu = Widget.extend({
         // Systray Menu
         this.systray_menu = new SystrayMenu(this);
         var systrayMenuProm = this.systray_menu.attachTo(this.$('.o_menu_systray')).then(function() {
+            self.systray_menu.on_attach_callback();  // At this point, we know we are in the DOM
             dom.initAutoMoreMenu(self.$section_placeholder, {
             maxWidth: function () {
                 return self.$el.width() - (self.$menu_apps.outerWidth(true) + self.$menu_brand_placeholder.outerWidth(true) + self.systray_menu.$el.outerWidth(true));
diff --git a/addons/web/static/src/js/chrome/systray_menu.js b/addons/web/static/src/js/chrome/systray_menu.js
index cb292a9b90f..0e25f2566de 100644
--- a/addons/web/static/src/js/chrome/systray_menu.js
+++ b/addons/web/static/src/js/chrome/systray_menu.js
@@ -39,6 +39,11 @@ var SystrayMenu = Widget.extend({
             return Promise.all(proms);
         });
     },
+    on_attach_callback() {
+        this.widgets
+            .filter(widget => widget.on_attach_callback)
+            .forEach(widget => widget.on_attach_callback());
+    },
     /**
      * Add the instanciated items, using the object located in this.wisgets
      */
diff --git a/addons/web/static/tests/chrome/menu_tests.js b/addons/web/static/tests/chrome/menu_tests.js
new file mode 100644
index 00000000000..c7ce40b16c2
--- /dev/null
+++ b/addons/web/static/tests/chrome/menu_tests.js
@@ -0,0 +1,47 @@
+odoo.define('web.menu_tests', function (require) {
+    "use strict";
+
+    const testUtils = require('web.test_utils');
+    const Menu = require('web.Menu');
+    const SystrayMenu = require('web.SystrayMenu');
+    const Widget = require('web.Widget');
+
+
+    QUnit.module('chrome', {}, function () {
+        QUnit.module('Menu');
+
+        QUnit.test('Systray on_attach_callback is called', async function (assert) {
+            assert.expect(4);
+
+            const parent = testUtils.createParent({});
+
+            // Add some widgets to the systray
+            const Widget1 = Widget.extend({
+                on_attach_callback: () => assert.step('on_attach_callback widget1')
+            });
+            const Widget2 = Widget.extend({
+                on_attach_callback: () => assert.step('on_attach_callback widget2')
+            });
+            SystrayMenu.Items = [Widget1, Widget2]
+
+            testUtils.mock.patch(SystrayMenu, {
+                on_attach_callback: function () {
+                    assert.step('on_attach_callback systray');
+                    this._super(...arguments);
+                }
+            });
+
+            const menu = new Menu(parent, {children: []});
+            await menu.appendTo($('#qunit-fixture'));
+
+            assert.verifySteps([
+                'on_attach_callback systray',
+                'on_attach_callback widget1',
+                'on_attach_callback widget2',
+            ]);
+            testUtils.mock.unpatch(SystrayMenu);
+            parent.destroy();
+        });
+    });
+
+});
diff --git a/addons/web/views/webclient_templates.xml b/addons/web/views/webclient_templates.xml
index 39513722b99..62ebfb2d6da 100644
--- a/addons/web/views/webclient_templates.xml
+++ b/addons/web/views/webclient_templates.xml
@@ -723,6 +723,7 @@
                 <script type="text/javascript" src="/web/static/tests/chrome/action_manager_tests.js"></script>
                 <script type="text/javascript" src="/web/static/tests/chrome/pager_tests.js"></script>
                 <script type="text/javascript" src="/web/static/tests/chrome/keyboard_navigation_mixin_tests.js"></script>
+                <script type="text/javascript" src="/web/static/tests/chrome/menu_tests.js"></script>
                 <script type="text/javascript" src="/web/static/tests/chrome/user_menu_tests.js"></script>
                 <script type="text/javascript" src="/web/static/tests/chrome/systray_tests.js"></script>