diff --git a/main/inc/lib/banner.lib.php b/main/inc/lib/banner.lib.php
index 77b5181af2..9b2053004d 100755
--- a/main/inc/lib/banner.lib.php
+++ b/main/inc/lib/banner.lib.php
@@ -215,6 +215,7 @@ function returnNotificationMenu()
     }
 
     $user_id = api_get_user_id();
+    $sessionId = api_get_session_id();
 
     $html = '';
 
@@ -250,11 +251,15 @@ function returnNotificationMenu()
                 .' '.$number_online_in_course.' </a></li>';
         }
 
-        if (isset($user_id) && api_get_session_id() != 0) {
+
+        if (isset($user_id) && $sessionId != 0) {
+            $numberOnlineInSession = getOnlineUsersInSessionCount($sessionId);
+
             $html .= '<li><a href="'.api_get_path(WEB_PATH)
                 .'whoisonlinesession.php?id_coach='.$user_id.'&amp;referer='.urlencode($_SERVER['REQUEST_URI'])
                 .'" target="_self">'
                 .Display::return_icon('session.png', get_lang('UsersConnectedToMySessions'), array(), ICON_SIZE_TINY)
+                .' '.$numberOnlineInSession
                 .'</a></li>';
         }
     }
@@ -887,3 +892,38 @@ function getOnlineUsersInCourseCount($userId, $_course)
 
     return $numberOnlineInCourse;
 }
+
+/**
+ * Helper function to get the number of users online in a session, using cache if available
+ * @param int $sessionId The session ID
+ * @return int The number of users currently online
+ */
+function getOnlineUsersInSessionCount($sessionId)
+{
+    $cacheAvailable = api_get_configuration_value('apc');
+
+    if (!$sessionId) {
+        return 0;
+    }
+
+    if ($cacheAvailable === true) {
+        $apcVar = api_get_configuration_value('apc_prefix').'my_campus_whoisonline_session_count_simple_'.$sessionId;
+
+        if (apcu_exists($apcVar)) {
+            return apcu_fetch($apcVar);
+        }
+
+        $numberOnlineInCourse = whoIsOnlineInIhisSessionCount(
+            api_get_setting('time_limit_whosonline'),
+            $sessionId
+        );
+        apcu_store($apcVar, $numberOnlineInCourse, 15);
+
+        return $numberOnlineInCourse;
+    }
+
+    return whoIsOnlineInIhisSessionCount(
+        api_get_setting('time_limit_whosonline'),
+        $sessionId
+    );
+}
diff --git a/main/inc/lib/online.inc.php b/main/inc/lib/online.inc.php
index 5532823063..166fcad830 100755
--- a/main/inc/lib/online.inc.php
+++ b/main/inc/lib/online.inc.php
@@ -461,6 +461,38 @@ function who_is_online_in_this_course_count($uid, $time_limit, $coursecode = nul
 	}
 }
 
+/**
+ * @param string $timeLimit
+ * @param int $sessionId
+ * @return bool
+ * @internal param int $uid
+ */
+function whoIsOnlineInIhisSessionCount($timeLimit, $sessionId)
+{
+    if (!$sessionId) {
+        return 0;
+    }
+
+	$tblTrackOnline = Database::get_main_table(TABLE_STATISTIC_TRACK_E_ONLINE);
+	$timeLimit = Database::escape_string($timeLimit);
+
+    $online_time = time() - $timeLimit * 60;
+    $current_date = api_get_utc_datetime($online_time);
+
+	$query = "SELECT count(login_user_id) as count
+              FROM $tblTrackOnline
+              WHERE login_user_id <> 2 AND session_id = $sessionId AND login_date >= '$current_date' ";
+	$result = Database::query($query);
+
+	if (Database::num_rows($result) > 0) {
+		$row = Database::fetch_assoc($result);
+
+		return $row['count'];
+	}
+
+    return 0;
+}
+
 /**
  * Register the logout of the course (usually when logging out of the platform)
  * from the track_e_course_access table