diff --git a/mod/assign/locallib.php b/mod/assign/locallib.php
index 7dc4c7ccdf4..aa5ac050b34 100644
--- a/mod/assign/locallib.php
+++ b/mod/assign/locallib.php
@@ -2346,6 +2346,9 @@ class assign {
                 }
             }
 
+            // Exclude suspended users from the list of participants.
+            $additionalfilters .= " AND u.suspended = 0 AND u.auth <> 'nologin'";
+
             $sql = "SELECT $fields
                       FROM {user} u
                       JOIN ($esql UNION $ssql) je ON je.id = u.id
diff --git a/mod/assign/tests/notification_helper_test.php b/mod/assign/tests/notification_helper_test.php
index 6d877242f60..3e8a9931a03 100644
--- a/mod/assign/tests/notification_helper_test.php
+++ b/mod/assign/tests/notification_helper_test.php
@@ -167,6 +167,14 @@ final class notification_helper_test extends \advanced_testcase {
         $user1 = $generator->create_user();
         $generator->enrol_user($user1->id, $course->id, 'student');
 
+        // Suspended user, should not receive notification.
+        $user2 = $generator->create_user(['suspended' => 1]);
+        $generator->enrol_user($user2->id, $course->id, 'student');
+
+        // Nologin user, should not receive notification.
+        $user3 = $generator->create_user(['auth' => 'nologin']);
+        $generator->enrol_user($user3->id, $course->id, 'student');
+
         /** @var \mod_assign_generator $assignmentgenerator */
         $assignmentgenerator = $generator->get_plugin_generator('mod_assign');
 
@@ -431,6 +439,14 @@ final class notification_helper_test extends \advanced_testcase {
         $course = $generator->create_course();
         $user1 = $generator->create_and_enrol($course, 'student');
 
+        // Suspended user, should not receive notification.
+        $user2 = $generator->create_user(['suspended' => 1]);
+        $generator->enrol_user($user2->id, $course->id, 'student');
+
+        // Nologin user, should not receive notification.
+        $user3 = $generator->create_user(['auth' => 'nologin']);
+        $generator->enrol_user($user3->id, $course->id, 'student');
+
         /** @var \mod_assign_generator $assignmentgenerator */
         $assignmentgenerator = $generator->get_plugin_generator('mod_assign');
 
@@ -653,6 +669,14 @@ final class notification_helper_test extends \advanced_testcase {
         $user1 = $generator->create_user();
         $generator->enrol_user($user1->id, $course->id, 'student');
 
+        // Suspended user, should not receive notification.
+        $user2 = $generator->create_user(['suspended' => 1]);
+        $generator->enrol_user($user2->id, $course->id, 'student');
+
+        // Nologin user, should not receive notification.
+        $user3 = $generator->create_user(['auth' => 'nologin']);
+        $generator->enrol_user($user3->id, $course->id, 'student');
+
         /** @var \mod_assign_generator $assignmentgenerator */
         $assignmentgenerator = $generator->get_plugin_generator('mod_assign');